JP2012089997A - Signal transmission device, electronic apparatus, and signal transmission method - Google Patents

Signal transmission device, electronic apparatus, and signal transmission method Download PDF

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Publication number
JP2012089997A
JP2012089997A JP2010233695A JP2010233695A JP2012089997A JP 2012089997 A JP2012089997 A JP 2012089997A JP 2010233695 A JP2010233695 A JP 2010233695A JP 2010233695 A JP2010233695 A JP 2010233695A JP 2012089997 A JP2012089997 A JP 2012089997A
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frequency
signal
carrier frequency
unit
carrier
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Kenji Komori
健司 小森
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Sony Corp
ソニー株式会社
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B1/00Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/06Receivers
    • H04B1/10Means associated with receiver for limiting or suppressing noise or interference induced by transmission
    • H04B1/109Means associated with receiver for limiting or suppressing noise or interference induced by transmission by improving strong signal performance of the receiver when strong unwanted signals are present at the receiver input

Abstract

An object of the present invention is to prevent the problem of intermodulation distortion when a plurality of sets of modulation circuits and demodulation circuits are provided and wireless transmission is performed using carrier signals having different frequencies in each set.
[Solution]
Three communication devices 710 are used as the first communication unit for transmission, and three communication devices 810 are used as the second communication unit for reception. In the corresponding transmission / reception set, modulation and demodulation are performed at carrier frequencies F_1 to F_3 having different frequencies. For the carrier frequencies of different frequencies, the bands of the modulation signals based on the respective carrier frequencies do not overlap each other, and the frequencies of the intermodulation distortion components generated based on the two adjacent carrier frequencies are the remaining frequencies. Each carrier frequency is set so that it does not exist in any of the bands of the modulation signal based on the carrier frequency.
[Selection] Figure 12

Description

  The present invention relates to a signal transmission device, an electronic device, and a signal transmission method. More specifically, the present invention relates to modulation distortion (particularly “intermodulation distortion”) generated due to nonlinearity of circuit members.

  In the communication area, signal transmission may be performed by a combination of a plurality of frequencies as well as transmission between a pair of transmission and reception using one carrier frequency. For example, when performing bidirectional simultaneous communication (using two carrier frequencies) by applying a frequency division multiplexing method between a pair of communication devices, or using a different carrier frequency between a plurality of communication devices ( One-way communication or two-way communication) may be performed. Further, there is provided a method for reducing a symbol rate as represented by OFDM (Orthogonal Frequency Division Multiplexing) transmission by providing a plurality of sets of modulation circuits and demodulation circuits between a pair of communication apparatuses. Multi-carrier (MC) transmission may be performed as one.

  Regardless of the number of sets of communication devices, a plurality of sets of modulation circuits and demodulation circuits are provided, and each set of modulation circuits and demodulation circuits performs simultaneous communication using different carrier frequencies. . When transmitting a combination of these plural frequencies, modulation distortion generated due to nonlinearity (non-linear operation) of circuit members such as an amplifier and a frequency mixing unit (mixer) degrades reception quality. For example, when a signal of two carrier frequencies that is completely unrelated to the desired wave (own station) is received and input to an amplifier circuit or a frequency mixing circuit having nonlinearity, a signal of the difference between the two carrier frequencies (interference wave) Component) is also output. At this time, when the difference between the two carrier frequencies exists in the vicinity of the frequency of the desired wave, there is a problem of “intermodulation distortion” in which this interference wave component is also demodulated. Typically, when signals of a plurality of frequencies adjacent to the reception band of the local station are received, if the linear performance of the amplifier circuit or the frequency mixing circuit is low, it is only necessary to consider the reception band (usually only the primary component of the modulation signal). ) Causes third-order distortion, which significantly deteriorates the reception quality.

  For example, Japanese Patent Application Laid-Open No. 55-38777 discloses a method for reducing the performance of a receiver in the case of a combination of spread spectrum and narrowband modulation. A method for arranging frequencies has been proposed. However, when a plurality of narrowband modulations are used, the third-order distortion is generated in the band of the spread modulation, and cannot be applied to the case of a plurality of spread modulations.

JP-A-55-38777

  As a technique for preventing the problem of “intermodulation distortion”, for example, a technique of adding a band-pass filter having wavelength selectivity to the input unit of the receiving circuit is known. However, this method causes an increase in cost for the band-pass filter and an increase in the substrate area. Further, since the band-pass filter generally operates only on a fixed frequency, it is difficult to use the corresponding frequency in a variable manner, and it is difficult to use the communication channel (in other words, the carrier frequency: hereinafter referred to as “band”). It is necessary to prepare for each.

  As another technique for preventing the problem of “intermodulation distortion”, a technique for improving “nonlinear operation of a circuit member” that is the cause of the occurrence is known. This is a technique that does not involve the addition of circuit members. For example, in order to increase the linear performance of the circuit, measures such as increasing the bias current and optimizing the DC bias point are effective so as to operate in the linear region as much as possible. Increase. Alternatively, it may be possible to use an expensive circuit member having good linearity, but even if an expensive circuit member is used, in principle, the nonlinearity cannot be made zero.

  As described above, the conventional method for preventing the problem of “intermodulation distortion” is to deal exclusively with the aspect of the circuit member, but in terms of cost, size, power supply voltage, power consumption, etc. It is not a universal one.

  An object of the present invention is to provide a technique capable of preventing the problem of “intermodulation distortion” from the side other than the circuit member.

  The signal transmission device according to the first aspect of the present invention includes a first communication unit that transmits a transmission target signal as a radio signal and a second communication unit that receives a radio signal transmitted from the first communication unit. A plurality of each is provided. Specifically, the first communication unit is provided with a modulation unit that modulates the transmission target signal, and the second communication unit is provided with a demodulation unit that demodulates the modulation signal modulated by the modulation unit. That is, a signal transmission apparatus is configured by providing a plurality of modulation units that modulate the transmission target signal and a plurality of demodulation units that demodulate the modulation signals modulated by the modulation unit. Each signal transmission device described in the dependent claims of the signal transmission device according to the first aspect of the present invention defines a further advantageous specific example of the signal transmission device according to the first aspect of the present invention.

  The electronic device according to the second aspect of the present invention relates to signal transmission in a so-called device, and a first communication unit that transmits a transmission target signal as a radio signal and a radio signal transmitted from the first communication unit. A plurality of second communication unit receiving units that receive the signal are provided in one casing. Specifically, the first communication unit is provided with a modulation unit that modulates the transmission target signal, and the second communication unit is provided with a demodulation unit that demodulates the modulation signal modulated by the modulation unit. That is, the electronic device is configured by arranging a plurality of modulation units that modulate the transmission target signal and a plurality of demodulation units that demodulate the modulation signals modulated by the modulation unit in one housing. In the electronic device, a radio signal transmission path is formed that allows the modulation signal modulated by the modulation unit to be transmitted as a radio signal.

  The electronic device according to the third aspect of the present invention relates to so-called signal transmission between devices, and at least one of a modulation unit that modulates a transmission target signal and a demodulation unit that demodulates a modulation signal modulated by the modulation unit is provided. A plurality of first electronic devices arranged in one housing, a demodulation unit corresponding to each modulation unit of the first electronic device, and a modulation unit corresponding to each demodulation unit of the first electronic device are each 1 One electronic device is configured as a whole, including a second electronic device arranged in one housing. That is, for each of the sets of the modulation unit and the demodulation unit, one of the modulation unit and the demodulation unit is arranged in the first electronic device, and the other of the modulation unit and the demodulation unit is arranged in the second electronic device. An entire electronic apparatus is configured by including a plurality of such combinations of modulation units and demodulation units. When all the modulation units are arranged in the first electronic device and all the demodulation units are arranged in the second electronic device, all the modulation units are arranged in the second electronic device and all the demodulation units Are arranged in the first electronic device, some of the modulation units and the remaining demodulation units are arranged in the first electronic device and correspond to the partial modulation units. Any of the case where the demodulator and the remaining set of demodulator and the corresponding modulator are arranged in the second electronic device may be used. Then, when the first electronic device and the second electronic device are arranged at predetermined positions, a wireless signal transmission path is formed that allows the modulation signal modulated by the modulation unit to be transmitted as a wireless signal. It has become.

  In the signal transmission method according to the fourth aspect of the present invention, a plurality of modulation units that modulate the transmission target signal and a plurality of demodulation units that demodulate the modulation signal modulated by the modulation unit are provided.

  And the signal transmission device according to the first aspect of the present invention, the electronic device according to the second aspect of the present invention, the electronic device according to the third aspect of the present invention, and the fourth aspect of the present invention In each of the signal transmission methods, the carrier frequency used in each set of the modulation unit and the demodulation unit is set to a different frequency. As a matter of course, a plurality of sets of modulation units and demodulation units are provided, and signal transmission is performed wirelessly (especially, radio waves) using carrier frequencies having different frequencies in each set.

Here, for the carrier frequency of each different frequency used in each set of the modulation unit and the demodulation unit,
1) Each carrier frequency is set so that the frequency of the intermodulation distortion component generated based on two adjacent carrier frequencies does not exist in the reception band of the modulated signal based on each remaining carrier frequency. To be in a state of being.
2) Preferably, the carrier frequencies are set so that the reception bands of the modulated signals based on the carrier frequencies do not overlap each other.

  When a plurality of sets of a modulation unit (modulation circuit) and a demodulation unit (demodulation circuit) are provided, and each group transmits a signal (especially a radio wave) using a carrier frequency having a different frequency, a desired wave (own station) ) Is a problem with intermodulation distortion in which signals of two carrier frequencies that have nothing to do with them are received (ie, within the reception band of the local station) and demodulated, so at least three carrier frequencies are used. Become. Therefore, paying attention to three adjacent carrier frequencies, the condition of 1) may be satisfied, preferably the condition of 2) may be satisfied. In addition, when four or more carrier frequencies are used, all of the adjacent three carrier frequency combinations satisfy the condition 1), preferably satisfy the condition 2). .

  The technique of the present invention can be realized by software using an electronic computer (computer), and a program for this purpose and a recording medium storing the program can be extracted as an invention. The program may be provided by being stored in a computer-readable storage medium, or may be provided by distribution via wired or wireless communication means.

  According to the present invention, a plurality of sets of modulation circuits and demodulation circuits are provided, and the arrangement of carrier frequencies used when signal transmission is performed wirelessly (especially radio waves) using carrier frequencies having different frequencies in each set. From the side, the problem of “intermodulation distortion” is prevented. Therefore, the problem of “intermodulation distortion” can be prevented without adding or changing circuit members.

FIG. 1 is a basic configuration for explaining the signal interface of the signal transmission apparatus according to the present embodiment in terms of functional configuration. 2A to 2C are diagrams illustrating a first example of a three-band frequency arrangement. FIGS. 3A to 3C are diagrams illustrating a second example of a 3-band frequency arrangement. 4A to 4C are diagrams illustrating a first example of a 4-band frequency arrangement. FIGS. 5A to 5C are diagrams illustrating a second example of a 4-band frequency arrangement. 6A to 6C are diagrams illustrating a first example of a 5-band frequency arrangement. FIGS. 7A to 7C are diagrams illustrating a second example of a 5-band frequency arrangement. FIGS. 8A to 8C are diagrams illustrating a first example of a 6-band frequency arrangement. FIGS. 9A to 9C are diagrams illustrating a second example of a 6-band frequency arrangement. FIGS. 10A to 10C are diagrams illustrating a first example of a 7-band frequency arrangement. FIGS. 11A to 11C are diagrams illustrating a second example of a 7-band frequency arrangement. FIG. 12A to FIG. 12C are diagrams for explaining the first embodiment. FIG. 13A to FIG. 13B are diagrams for explaining the second embodiment. FIG. 14A to FIG. 14B are diagrams for explaining the third embodiment. FIG. 15A to FIG. 15B are diagrams for explaining the fourth embodiment. FIG. 16A to FIG. 16B are diagrams illustrating a modification of the fourth embodiment. FIG. 17A to FIG. 17B are diagrams for explaining the fifth embodiment. 18A to 18B are diagrams illustrating a first example of an electronic apparatus according to the sixth embodiment. FIG. 19A to FIG. 19C are diagrams illustrating a second example of the electronic apparatus according to the sixth embodiment. 20A to 20C are diagrams illustrating a third example of the electronic apparatus according to the sixth embodiment. FIG. 21 is a diagram illustrating a comparison with the comparative example, and is a diagram illustrating a basic frequency arrangement of the frequency division multiplexing method. FIG. 22 is a diagram illustrating a comparison with the comparative example, and is a diagram illustrating a method of the comparative example for preventing modulation distortion. FIG. 23 is a first modified configuration for explaining the signal interface of the signal transmission device of the present embodiment from the functional configuration side. FIG. 24 shows a second modified configuration for explaining the signal interface of the signal transmission device of the present embodiment from the functional configuration side.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. When distinguishing each functional element by form, an uppercase alphabetic reference is added, such as A, B, C,..., And this reference is omitted when it is not particularly distinguished. And describe. The same applies to the drawings.

The description will be made in the following order.
1. Overall overview Communication processing system: Basic 3.3 Band frequency arrangement 4.4 Band frequency arrangement 5.5 Band frequency arrangement 6.6 Band frequency arrangement 7.7 Band frequency arrangement Specific application example Example 1: No transmission & control on the same board (preset)
Example 2: Control on the same board transmission & transmission side Example 3: Control on the same board transmission & transmission side and reception side Example 4: With board-to-board transmission & control in one electronic device Example 5: Inter-device transmission & control Example 6: Application examples to electronic devices Comparison with comparative example
Ten. Communication processing system: Modification (frequency allocation presetting)

<Overview>
[Signal transmission device, signal transmission method]
In the configuration of the present embodiment corresponding to the first to fourth aspects of the present invention, the first communication unit that transmits the transmission target signal as a radio signal and the radio signal transmitted from the first communication unit are transmitted. One or a plurality of second communication units to receive are provided to constitute a signal transmission device (also referred to as a wireless transmission device) or an electronic device. The 1st communication part which makes a transmission function transmits a signal for transmission as a radio signal. The second communication unit having a reception function receives the radio signal transmitted from the first communication unit. The first communication unit includes a modulation unit that modulates the transmission target signal, and the second communication unit includes a demodulation unit that demodulates the modulation signal modulated by the modulation unit. A plurality of each is provided to constitute a signal transmission device. In general, a member (so-called bandpass filter) having a wavelength selectivity that allows a desired wave to pass but suppresses the others is provided between the antenna and the receiving circuit (second communication unit). In this embodiment, a member having such wavelength selectivity is not required.

  Regardless of the number of pairs of the first communication unit and the second communication unit (in other words, the number of pairs of transmission and reception pairs), a plurality of pairs of modulation units and demodulation units are provided, and the modulation unit and the demodulation unit are provided. The carrier frequencies used in each set are different frequencies. Here, for the carrier frequencies having different frequencies, the frequency of the intermodulation distortion component generated based on the two adjacent carrier frequencies is present in any of the reception bands of the modulation signals based on the remaining carrier frequencies. Each carrier frequency is set so that it does not occur.

  Without changing the receiving circuit, it is possible to avoid the influence of deterioration of the receiving performance due to the intermodulation distortion in the receiving circuit by the frequency arrangement. Since the influence of intermodulation distortion can be avoided by the frequency arrangement, a high-selectivity band-limiting filter is not necessary, and a small-size receiving circuit can be configured at low cost. Since the influence of intermodulation distortion can be avoided by the frequency arrangement, the distortion performance of the receiving circuit can be relaxed, and a small size and low power consumption configuration is also possible.

  When the modulated signal modulated by the modulating unit is transmitted as a radio signal, and the radio signal is received and input to the demodulating unit to perform signal transmission, each pair used by the modulating unit and the demodulating unit is different. Regarding the carrier frequency of the frequency, preferably, each carrier frequency is set so that the reception bands of the modulated signals based on each carrier frequency do not overlap each other.

  When a plurality of sets of modulation circuits and demodulation circuits are provided and signal transmission is performed wirelessly (especially radio waves) using carrier signals having different frequencies in each set, there is no relation to the desired wave (own station) 2 Since there is a problem of intermodulation distortion in which a signal of one carrier frequency enters the reception band of the local station and is demodulated, at least three carrier frequencies are used. The frequency arrangement may be determined by paying attention to three adjacent carrier frequencies. In this case, it is preferable to satisfy the following conditions for three adjacent carrier frequencies.

[First condition]
The difference between the lowest carrier frequency F_L of the three carrier frequencies and the intermediate carrier frequency F_M is defined as a first frequency difference Δ1,
When the difference between the highest carrier frequency F_H among the three carrier frequencies and the intermediate carrier frequency F_M is the second frequency difference Δ2,
The reception bandwidth F_a_U on the high frequency side of the modulated signal based on the carrier frequency F_a on the low frequency side that defines the smaller one ΔS of the first frequency difference Δ1 and the second frequency difference Δ2, and the first frequency difference Δ1. And the reception bandwidth F_b_L on the low frequency side of the modulated signal based on the carrier frequency F_b on the high frequency side that defines the smaller one ΔS of the second frequency difference Δ2 is the first frequency difference Δ1 and the second frequency difference Δ2 It is smaller than the smaller one ΔS of the frequency differences Δ2. The first condition can be expressed by the formula (A).
“F_a_U” + “F_b_L” <ΔS (A)

[Second condition]
When the first frequency difference Δ1 is smaller than the second frequency difference Δ2, the difference “| Δ1-Δ2 |” between the first frequency difference Δ1 and the second frequency difference Δ2 is the lowest frequency carrier. It is larger than the larger one of the reception bandwidth F_L_L on the low frequency side of the modulation signal based on the frequency F_L and the reception bandwidth F_H_L on the low frequency side of the modulation signal based on the highest carrier frequency F_H. The second condition can be expressed by the formula (B).
The larger of “F_L_L” and “F_H_L” <| Δ1−Δ2 | (B)

[Third condition]
When the first frequency difference Δ1 is greater than the second frequency difference Δ2, the difference “| Δ1-Δ2 |” between the first frequency difference Δ1 and the second frequency difference Δ2 is the lowest frequency carrier. The higher one of the reception bandwidth F_L_H on the high frequency side of the modulation signal based on the frequency F_L and the reception bandwidth F_H_H on the high frequency side of the modulation signal based on the highest carrier frequency F_H. The third condition can be expressed by the formula (C).
The larger one of “F_L_H” and “F_H_H” <| Δ1-Δ2 | (C)

If the larger one of the first frequency difference Δ1 and the second frequency difference Δ2 is ΔL, “| Δ1-Δ2 |” = ΔL−ΔS is satisfied, so that the expression (A) indicating the first condition and the second When formula (B) indicating the conditions is summarized, it can be represented by formula (D).
“F_a_U” + “F_b_L” <ΔS <ΔL−α (D)
However, α = “F_L_L” or “F_H_L”, whichever is larger

If the larger one of the first frequency difference Δ1 and the second frequency difference Δ2 is ΔL, “| Δ1−Δ2 |” = ΔL−ΔS is satisfied, so that the expression (A) indicating the first condition and the third When formula (C) indicating the conditions is summarized, it can be expressed by formula (E).
“F_a_U” + “F_b_L” <ΔS <ΔL−β (E)
β = the larger of "F_L_H" and "F_H_H"

  When four or more carrier frequencies are used, as a first aspect, the first condition is satisfied for any combination of three adjacent carrier frequencies, and the first frequency difference Δ1 When the second frequency difference Δ2 is smaller than the second frequency difference Δ2, the second condition is satisfied, and when the first frequency difference Δ1 is larger than the second frequency difference Δ2, the third condition is satisfied.

When four or more carrier frequencies are used, as a second aspect, any of the combinations of three adjacent carrier frequencies may satisfy the following conditions.
[Fourth condition]
Of the three carrier frequencies, the intermodulation wave generated on the lower frequency side than the lowest carrier frequency among the intermodulation waves generated based on the lowest carrier frequency and the intermediate carrier frequency Does not exist in the band of the modulated signal based on the carrier frequency on the lower frequency side than the lowest carrier frequency.
[Fifth condition]
Of the three carrier frequencies, the intermodulation wave generated on the higher frequency side than the highest carrier frequency among the intermodulation waves generated based on the highest carrier frequency and the intermediate carrier frequency Does not exist in the band of the modulated signal based on the carrier frequency higher than the highest carrier frequency.
The fourth condition and the fifth condition are such that even when four or more carrier frequencies are used, the frequency of the intermodulation distortion component generated based on two adjacent carrier frequencies is modulated based on each carrier frequency. It does not exist anywhere in the signal band.

  Preferably, the transmission characteristic between transmission and reception is known, and at least one of the first communication unit and the second communication unit, a signal processing unit that performs predetermined signal processing based on a set value; A setting value processing unit that inputs a predetermined setting value for signal processing to the signal processing unit may be provided. For example, when the arrangement position of the first communication unit and the second communication unit in one housing does not change (in the case of in-device communication), each of the first communication unit and the second communication unit is different. Even when it is placed in the housing of the case, the placement positions of the first communication unit and the second communication unit when in use are in a predetermined state (in the case of wireless transmission between devices at relatively short distances) ), The transmission characteristics between the first communication unit and the second communication unit can be known in advance under an environment where transmission conditions between transmission and reception do not substantially change (that is, are fixed). .

  In an environment where transmission conditions between transmission and reception do not substantially change (that is, are fixed), even if the setting value that defines the operation of the signal processing unit is treated as a fixed value, that is, even if the parameter setting is fixed, The signal processing unit can be operated without inconvenience. Since the setting value for signal processing is set to a predetermined value (that is, a fixed value), it is not necessary to dynamically change the parameter setting, so that the parameter calculation circuit can be reduced and the power consumption can also be reduced. . In wireless transmission between devices or between devices at relatively short distances, the communication environment is fixed, so various circuit parameters that depend on the communication environment can be determined in advance, and in environments where the transmission conditions are fixed Even if the setting value that defines the operation of the signal processing unit is treated as a fixed value, that is, even if the parameter setting is fixed, the signal processing unit can be operated without any inconvenience. For example, by obtaining optimum parameters at the time of factory shipment and holding the parameters inside the apparatus, it is possible to reduce the parameter arithmetic circuit and power consumption.

  There are various signal processing parameter settings. For example, in relation to the case where simultaneous communication is performed using a plurality of different carrier frequencies, there is a setting of a modulation carrier frequency and a demodulation carrier frequency. Other examples of signal processing parameter setting include gain setting (signal amplitude setting) of a signal amplification circuit (amplitude adjustment unit), setting of a phase adjustment amount, setting of frequency characteristics, and the like. The gain setting is used for transmission power setting, reception level setting input to the demodulation function unit, automatic gain control (AGC), etc., and the phase adjustment amount is set by separately transmitting a carrier signal and a clock. This is used when the phase is adjusted in accordance with the delay amount of the transmission signal in the system, and the frequency characteristic setting is used when the amplitude of the low frequency component and the high frequency component is emphasized in advance on the transmission side. .

  Preferably, all of the modulation unit and the demodulation unit are arranged on one circuit board. In this case, it is easy to create an environment in which transmission conditions between transmission and reception are not substantially changed (that is, fixed), and it is convenient to fix the carrier frequency to be used in advance.

  Even when all of the modulation unit and the demodulation unit are disposed on one circuit board, a configuration may be provided in which each modulation unit includes a control unit that switches a carrier frequency used for transmission. By controlling only the carrier frequency on the transmission side, appropriate frequency allocation can be performed, and optimal control can be performed so as not to be affected by the intermodulation distortion.

  Even when all of the modulation unit and the demodulation unit are arranged on one circuit board, a configuration may be provided that includes a control unit that switches the carrier frequency used by each demodulation unit for reception. By controlling only the carrier frequency on the receiving side, appropriate frequency allocation can be performed, and optimal control can be performed so as not to be affected by the intermodulation distortion.

  Control for switching the carrier frequency used by each modulator for transmission and switching the carrier frequency used for reception by each demodulator even when all of the modulator and demodulator are arranged on one circuit board You may make it the structure provided with a part. More flexible control can be performed than a configuration in which only the carrier frequency on the transmission side or only the carrier frequency on the reception side is controlled.

  When the modulation unit and the demodulation unit are scattered on a plurality of circuit boards, it is preferable that each modulation unit includes a control unit that switches a carrier frequency used for transmission. By controlling only the carrier frequency on the transmission side, appropriate frequency allocation can be performed, and optimal control can be performed so as not to be affected by the intermodulation distortion.

  As another form in the case where the modulation unit and the demodulation unit are scattered on a plurality of circuit boards, it is preferable that each demodulation unit includes a control unit that switches a carrier frequency used for reception. By controlling only the carrier frequency on the receiving side, appropriate frequency allocation can be performed, and optimal control can be performed so as not to be affected by the intermodulation distortion.

  As another form in the case where the modulation unit and the demodulation unit are scattered on a plurality of circuit boards, preferably, the carrier frequency used by each modulation unit for transmission and the carrier used by each demodulation unit for reception are preferable. A configuration including a control unit for switching the frequency may be used. More flexible control can be performed than a configuration in which only the carrier frequency on the transmission side or only the carrier frequency on the reception side is controlled.

  When the configuration includes a control unit for switching the carrier frequency, a control signal for switching the carrier frequency may be transmitted to the modulation unit or the demodulation unit by wire. This form can be applied even when the modulation unit and the demodulation unit are scattered on a plurality of circuit boards, but particularly when all of the modulation unit and the demodulation unit are arranged on one circuit board. convenient. In order to perform wired transmission when the modulation unit and the demodulation unit are scattered on a plurality of circuit boards, a so-called wire harness is required, whereas the modulation unit and the demodulation unit are all on one circuit board. This is because printed wiring is sufficient if they are arranged.

  When the configuration includes a control unit for switching the carrier frequency, a control signal for switching the carrier frequency may be wirelessly transmitted to the modulation unit or the demodulation unit. This configuration is particularly convenient when the modulation unit and the demodulation unit are scattered on a plurality of circuit boards. This is because, even in the case of transmission between physically separated boards, a control signal for frequency allocation can be transmitted to each communication device without using a wire harness. This form can be applied even when all of the modulation unit and the demodulation unit are arranged on one circuit board. In this case, the wireless transmission is more effective when the wired transmission using the printed wiring is applied. There is an advantage in terms of cost, circuit scale, and power consumption because the circuit configuration to be realized is unnecessary.

  When the control signal for switching the carrier frequency is wirelessly transmitted to the modulation unit or the demodulation unit, the use band of the radio signal of the control signal for switching the carrier frequency is the use band of the radio signal of the transmission target signal. It is good to go outside. In this case, it can be reliably ensured that the wireless transmission of the control information does not hinder the wireless transmission of the transmission target signal.

  When the control signal for switching the carrier frequency is wirelessly transmitted to the modulation unit or the demodulation unit, the use band of the radio signal of the control signal for switching the carry carrier frequency is the use band of the radio signal of the transmission target signal. In this case, the carrier frequency of the radio signal of the control signal may be set so that the influence of reception performance deterioration due to intermodulation distortion in the receiving circuit can be avoided.

  When the control signal for switching the carrier frequency is wirelessly transmitted to the modulation unit or the demodulation unit, the use band of the radio signal of the control signal for switching the carry carrier frequency is the use band of the radio signal of the transmission target signal. In this case, the same frequency may be used as the carrier frequency of the control signal for switching the carrier frequency and the carrier frequency of the transmission target signal. In this case, the pair of the modulation unit and the demodulation unit can be used both for transmitting a normal modulated signal and for transmitting a control signal. Since it is not necessary to separately provide a transmission / reception pair for transmission of the control signal, a low cost, small size and low power consumption configuration can be achieved.

[Electronics]
In the electronic apparatus according to the present embodiment corresponding to the second aspect of the present invention or the third aspect of the present invention, one electronic apparatus may be configured with a device configuration in which each unit is accommodated in one casing. The whole of one electronic device may be configured by a combination of a plurality of devices (electronic devices). The signal transmission device of this embodiment is used in electronic devices such as a digital recording / reproducing device, a terrestrial television receiver, a mobile phone device, a game device, and a computer.

  In the signal transmission device and the electronic device of the present embodiment described below, the carrier frequency in the millimeter wave band (wavelength is 1 to 10 millimeters) will be mainly used. Also applicable when using carrier frequencies near the millimeter wave band, such as sub-millimeter wave band (wavelength is 0.1 to 1 millimeter) and longer wavelength centimeter wave band (wavelength is 1 to 10 centimeter). It is. For example, when performing simultaneous communication using different carrier frequencies, if the number of carrier frequencies used (number of bands) increases and the required communication band cannot be secured only in the millimeter wave band, the submillimeter wave band to the millimeter wave band Band, millimeter wave band to centimeter wave band, or submillimeter wave band to millimeter wave band to centimeter wave band are used.

  When configuring a communication device, there are cases where the transmission side (that is, the first communication unit) alone, cases where the reception side (that is, the first communication unit) alone, and cases where both the transmission side and the reception side are included. . The transmitting side and the receiving side are coupled via a radio signal transmission path (for example, a millimeter wave signal transmission path) and configured to perform signal transmission in the millimeter wave band. The signal to be transmitted is frequency-converted to a millimeter wave band suitable for broadband transmission and transmitted. However, in any case, the signal transmission device is configured by a pair (pair) of the first communication unit and the second communication unit. In particular, in the case of the present embodiment, simultaneous communication is performed using different carrier frequencies, so it does not matter whether the number of pairs (pairs) of the first communication unit and the second communication unit is one or plural. First, a plurality of pairs (pairs) of modulation units and demodulation units are provided.

  And between the 1st communication part and the 2nd communication part arrange | positioned at a comparatively short distance, after converting the signal of transmission object into a millimeter wave signal, this millimeter wave signal is sent to a millimeter wave signal transmission path. Transmitted through. “Wireless transmission” in the present embodiment means that a signal to be transmitted is transmitted by radio (radio wave: millimeter wave in this example) instead of general electric wiring (simple wire wiring).

  “Relatively close” means that the distance is short compared to the distance between communication devices in the outdoors (outdoors) used in broadcasting and general wireless communication, and the transmission range is closed. Any material that can be substantially specified may be used. “Closed space” means a space where there is little leakage of radio waves from the inside of the space to the outside, and conversely, there is little arrival (intrusion) of radio waves from the outside to the inside of the space. The entire space is surrounded by a casing (case) that has a shielding effect against radio waves. For example, a plurality of electronic devices are integrated, such as inter-board communication within a housing of one electronic device, inter-chip communication on the same substrate, or a state in which the other electronic device is mounted on one electronic device. This corresponds to communication between devices in a connected state. The “integrated” is typically a state in which both electronic devices are completely in contact with each other, but it may be of a level that can be substantially specified as a space in which the transmission range between the two electronic devices is closed. For example, the case where both electronic devices are arranged at a predetermined position in a relatively short distance, such as within a few centimeters or within a few tens of centimeters, can be regarded as being “substantially” integral. In short, it suffices if there is little leakage of radio waves from the inside to the outside where radio waves composed of both electronic devices can propagate, and conversely, there is little arrival (intrusion) of radio waves from outside to the inside of the space.

  Hereinafter, signal transmission within a casing of one electronic device is referred to as signal transmission within the casing, and signal transmission in a state in which a plurality of electronic devices are integrated (hereinafter also including “substantially integrated”) is performed. This is called inter-signal transmission. In the case of signal transmission within the housing, the communication device on the transmission side (communication unit: transmission unit) and the communication device on the reception side (communication unit: reception unit) are accommodated in the same housing, and the communication unit (transmission unit and reception unit) A signal transmission device in which a wireless signal transmission path is formed therebetween can be an electronic device itself. On the other hand, in the case of signal transmission between devices, the communication device on the transmission side (communication unit: transmission unit) and the communication device on the reception side (communication unit: reception unit) are accommodated in different electronic device casings, and both electronic devices are A radio signal transmission path is formed between communication units (transmission unit and reception unit) in both electronic devices when they are arranged at a predetermined position and integrated with each other, thereby constructing a signal transmission device.

  In each communication device provided across the millimeter wave signal transmission path, a transmission system and a reception system are paired and arranged. Two-way communication can be performed by causing each communication device to have both a transmission system and a reception system. When transmitting and receiving systems coexist in each communication device, signal transmission between one communication device and the other communication device may be one-way (one-way) or two-way. For example, when the first communication device is a transmission side and the second communication device is a reception side, a first communication unit that performs a transmission function is arranged in the first communication device and is received by the second communication device. A second communication unit having a function is arranged. When the second communication device is a transmission side and the first communication device is a reception side, a first communication unit that performs a transmission function is arranged in the second communication device, and the first communication device has a reception function. A second communication unit is arranged.

  The first communication unit is, for example, a signal generator on the transmission side that performs signal processing on a transmission target signal to generate a millimeter wave band electrical signal (a signal that converts a transmission target electrical signal into a millimeter wave band electrical signal). Converter) and a signal on the transmission side that couples the millimeter-wave band electrical signal generated by the signal generation unit on the transmission side to a radio signal transmission path (for example, a millimeter-wave signal transmission path) that transmits a millimeter-wave band radio signal Assume that the transmitter is provided with a coupling unit. Preferably, the signal generator on the transmission side is integrated with a functional unit that generates a signal to be transmitted.

  For example, the signal generator on the transmission side includes a modulation circuit (modulation unit), and the modulation circuit modulates a signal to be transmitted (baseband signal). The signal generator on the transmission side converts the frequency of the signal after being modulated by the modulation circuit to generate an electrical signal in the millimeter wave band. In principle, a signal to be transmitted may be directly converted into a millimeter wave band electrical signal. The signal coupling unit on the transmission side converts the millimeter-wave band electrical signal generated by the signal generation unit on the transmission side into a radio signal (electromagnetic wave, radio wave) and supplies it to the millimeter wave signal transmission path as a radio signal transmission path .

  For example, the second communication unit receives, as a reception unit, a signal coupling unit on the reception side that receives a millimeter-wave band radio signal transmitted via a millimeter-wave signal transmission path as a radio signal transmission path and converts the radio signal into an electrical signal. In addition, the millimeter waveband electrical signal (input signal) received by the signal coupling unit on the receiving side and converted into an electrical signal is processed to generate a normal electrical signal (signal to be transmitted, baseband signal) ( It is assumed that a signal generation unit on the reception side (restoration and reproduction) (a signal conversion unit that converts a millimeter wave signal into an electric signal to be transmitted) is provided. Preferably, the signal generation unit on the reception side is integrated with a function unit that receives a signal to be transmitted. For example, the signal generation unit on the receiving side has a demodulation circuit (demodulation unit), generates an output signal by converting the frequency of an electrical signal in the millimeter wave band, and then the demodulation circuit demodulates the output signal to be transmitted. Generate a signal. In principle, a millimeter wave band electrical signal may be directly converted into a signal to be transmitted.

  In other words, when taking the signal interface, the signal to be transmitted is transmitted by wireless signals without contact or cable (not transmitted by electrical wiring). Preferably, at least signal transmission (especially a video signal or high-speed clock signal that requires high-speed transmission or large-capacity transmission) is transmitted by a radio signal such as a millimeter wave band. In short, signal transmission that has been performed by electrical wiring in the past is performed by radio signals (radio waves) in this embodiment. By performing signal transmission with a radio signal in the millimeter wave band or the like, high-speed signal transmission in the order of gigabit per second [Gbps] can be realized, and the range covered by the radio signal can be easily limited. Can also be obtained.

  Here, in each signal coupling unit, the first communication unit and the second communication unit transmit a radio signal (in this case, a millimeter wave band radio signal) via a radio signal transmission path (for example, a millimeter wave signal transmission path). Anything that makes it possible is acceptable. For example, it may be provided with an antenna structure (antenna coupling portion), or may be coupled without an antenna structure. A wireless signal transmission path such as “millimeter wave signal transmission path for transmitting a millimeter wave signal” may be air (so-called free space), but preferably a wireless signal (electromagnetic wave, radio wave) is transmitted into the transmission path. What has a structure (wireless signal confinement structure, for example, millimeter wave confinement structure) which transmits a radio signal while confining is good. By actively using the radio signal confinement structure, it is possible to arbitrarily determine the routing of the radio signal transmission path, such as electrical wiring. As such a radio signal confinement structure, for example, a so-called waveguide is typically applicable, but it is not limited thereto. For example, a material made of a dielectric material capable of transmitting a wireless signal (referred to as a dielectric transmission line or a wireless signal dielectric transmission line), or a shielding material that constitutes a transmission line and suppresses external radiation of the wireless signal. Is preferably provided so as to surround the transmission line, and the inside of the shielding material is hollow. By giving flexibility to the dielectric material and the shielding material, the wireless signal transmission path can be routed. In the case of air (so-called free space), each signal coupling portion has an antenna structure, and signals are transmitted in a short-distance space by the antenna structure. On the other hand, when it is assumed that it is made of a dielectric material, an antenna structure can be taken, but this is not essential.

[Contrast between signal transmission by electric wiring and wireless transmission]
In signal transmission in which signal transmission is performed via electric wiring, there are the following problems.
i) Large capacity and high speed of transmission data are required, but there are limits to the transmission speed and capacity of electrical wiring.
ii) In order to cope with the problem of high-speed transmission data, there is a method of increasing the number of wires and reducing the transmission speed per signal line by parallelizing signals. However, this method leads to an increase in input / output terminals. As a result, complicated printed circuit boards and cable wiring, increased physical size of connectors and electrical interfaces, etc. are required, their shapes become complicated, their reliability decreases, and costs increase. Happens.
iii) With the increase in the amount of information such as movie images and computer images, the problem of EMC (electromagnetic compatibility) becomes more apparent as the band of the baseband signal becomes wider. For example, when electrical wiring is used, the wiring becomes an antenna, and a signal corresponding to the tuning frequency of the antenna is interfered. Also, reflections and resonances due to wiring impedance mismatch and the like also cause unnecessary radiation. In order to cope with such a problem, the configuration of the electronic device is complicated.
iv) In addition to EMC, if there is reflection, a transmission error due to interference between symbols on the receiving side or a transmission error due to jumping in interference will also become a problem.

On the other hand, when signal transmission is performed wirelessly (for example, using a millimeter wave band) instead of electrical wiring, there is no need to worry about the wiring shape and connector position, so that there are not many restrictions on the layout. For signals replaced with signal transmission by millimeter waves, wiring and terminals can be omitted, which eliminates the problem of EMC. In general, there is no other functional unit that uses a millimeter-wave band frequency inside the communication device, so that EMC countermeasures can be easily realized. Wireless transmission is performed in a state in which the communication device on the transmission side and the communication device on the reception side are close to each other, and signal transmission is performed between fixed positions or in a known positional relationship. Therefore, the following advantages are obtained.
1) It is easy to properly design a propagation channel (waveguide structure) between the transmission side and the reception side.
2) Higher reliability than free space transmission by designing the dielectric structure of the transmission line coupling part that seals the transmission side and the reception side and the propagation channel (waveguide structure of the millimeter wave signal transmission line) together Good transmission is possible.
3) Since the controller for managing the wireless transmission does not need to be dynamically and frequently controlled as in general wireless communication, the overhead due to control can be reduced as compared with general wireless communication. As a result, a set value (so-called parameter) used in a control circuit, an arithmetic circuit, or the like can be made a constant (so-called fixed value), and miniaturization, low power consumption, and high speed can be achieved. For example, if the wireless transmission characteristics are calibrated at the time of manufacture or design and the individual variations are grasped, the data can be referred to. Therefore, the setting values that define the operation of the signal processing unit can be preset or statically controlled. . Since the set value prescribes the operation of the signal processing unit appropriately, high-quality communication is possible while having a simple configuration and low power consumption.

Moreover, the following advantages can be obtained by using wireless communication in the millimeter-wave band with a short wavelength.
a) Since the millimeter wave communication can take a wide communication band, it is easy to increase the data rate.
b) The frequency used for transmission can be separated from the frequency of other baseband signal processing, and interference between the millimeter wave and the frequency of the baseband signal hardly occurs.
c) Since the millimeter wave band has a short wavelength, it is possible to reduce the size of an antenna or a waveguide structure depending on the wavelength. In addition, since the distance attenuation is large and the diffraction is small, electromagnetic shielding is easy to perform.
d) In normal outdoor wireless communication, the stability of a carrier wave has strict regulations to prevent interference and the like. In order to realize such a highly stable carrier wave, a highly stable external frequency reference component, a multiplier circuit, a PLL (phase locked loop circuit), and the like are used, which increases the circuit scale. However, millimeter waves can be easily shielded (especially when used in combination with signal transmission between fixed positions or with a known positional relationship) and can be prevented from leaking outside. In order to demodulate a signal transmitted by a carrier wave having a low stability with a small circuit on the receiving side, it is preferable to adopt an injection locking method.

  For example, LVDS (Low Voltage Differential Signaling) is known as a technique for realizing high-speed signal transmission between electronic devices arranged within a relatively short distance (for example, within a few tens of centimeters) or within an electronic device. However, with the recent increase in transmission data capacity and speed, there are problems such as increased power consumption, increased signal distortion due to reflection and the like, increased unwanted radiation (so-called EMI problem), and the like. For example, LVDS has reached its limit when signals such as video signals (including imaging signals) and computer images are transmitted at high speed (in real time) between devices or between devices.

  In order to support high-speed data transmission, the number of wires may be increased and the transmission speed per signal line may be reduced by parallelizing signals. However, this countermeasure leads to an increase in input / output terminals. As a result, it is required to increase the complexity of the printed circuit board and the cable wiring and to increase the semiconductor chip size. Also, so-called electromagnetic field interference becomes a problem when high-speed and large-capacity data is routed by wiring.

  Any problems in the LVDS or the method of increasing the number of wirings are caused by transmitting signals through electrical wiring. Therefore, as a technique for solving the problem caused by transmitting a signal through the electrical wiring, a technique of transmitting the electrical wiring wirelessly (particularly, a technique of performing signal transmission using radio waves) may be employed. As a technique for wirelessly transmitting electrical wiring, for example, signal transmission within the housing is performed wirelessly, and a UWB (Ultra Wide Band) communication system may be applied (referred to as a first technique), A carrier frequency in the short (1-10 millimeter) millimeter wave band may be used (denoted as the second technique). However, the UWB communication method of the first method has a problem in size such as a low carrier frequency, which is not suitable for high-speed communication for transmitting a video signal, for example, and an antenna becomes large. Further, since the frequency used for transmission is close to the frequency of other baseband signal processing, there is a problem that interference easily occurs between the radio signal and the baseband signal. Further, when the carrier frequency is low, it is easily affected by drive system noise in the device, and it is necessary to deal with it. On the other hand, when the carrier frequency in the millimeter wave band having a shorter wavelength is used as in the second method, problems of antenna size and interference can be solved.

  Here, the case where wireless communication is performed in the millimeter wave band has been described, but the application range is not limited to that in which communication is performed in the millimeter wave band. Communication in a frequency band lower than the millimeter wave band (centimeter wave band), or conversely, a frequency band higher than the millimeter wave band (sub-millimeter wave band) may be applied. However, it is effective to mainly use the millimeter wave band in which the wavelength is not excessively long or short in signal transmission within a casing or signal transmission between devices.

  Hereinafter, the signal transmission device and the electronic apparatus according to the present embodiment will be specifically described. As a most preferable example, an example in which many functional units are formed in a semiconductor integrated circuit (chip, for example, a CMOS IC) will be described, but this is not essential.

<Communication processing system: Basic>
FIG. 1 is a basic configuration for explaining the signal interface of the signal transmission apparatus according to the present embodiment in terms of functional configuration.

[Function configuration]
As shown in FIG. 1, the signal transmission device 1 includes a first communication device 100 that is an example of a first wireless device and a second communication device 200 that is an example of a second wireless device via a wireless signal transmission path 9. In this way, signal transmission is performed using radio signals mainly in the millimeter wave band. In the figure, a transmission system is provided on the first communication device 100 side, and a reception system is provided on the second communication device 200.

  The first communication device 100 is provided with a semiconductor chip 103 corresponding to millimeter wave band transmission, and the second communication device 200 is provided with a semiconductor chip 203 corresponding to millimeter wave band reception.

  In this embodiment, the signals to be communicated in the millimeter wave band are limited to signals that require high speed and large capacity, and other signals that can be regarded as direct current, such as those that are sufficient for low speed and small capacity, and power sources. Not converted to millimeter wave signal. For signals (including power supplies) that are not converted into millimeter wave signals, signals are connected between the substrates in the same manner as before. The original electrical signals to be transmitted before being converted into millimeter waves are collectively referred to as baseband signals.

[First communication device]
In the first communication device 100, a semiconductor chip 103 that supports millimeter wave band transmission and a transmission path coupling unit 108 are mounted on a substrate 102. The semiconductor chip 103 is an LSI (Large Scale Integrated Circuit) in which an LSI function unit 104 and a signal generation unit 107 (millimeter wave signal generation unit) are integrated. The semiconductor chip 103 is connected to the transmission line coupling unit 108. The transmission path coupling unit 108 is an example of a transmission unit that converts an electrical signal into a radio signal and transmits the radio signal to the radio signal transmission path 9. For example, an antenna including an antenna coupling unit, an antenna terminal, a microstrip line, an antenna, and the like. The structure is applied. A coupling point between the transmission path coupling unit 108 and the wireless signal transmission path 9 is a transmission point.

  The LSI function unit 104 controls the main application of the first communication device 100, and includes, for example, a circuit that processes various signals desired to be transmitted to the other party.

  The signal generation unit 107 (electric signal conversion unit) includes a transmission-side signal generation unit 110 for converting a signal from the LSI function unit 104 into a millimeter wave signal and performing signal transmission control via the wireless signal transmission path 9. . The transmission side signal generation unit 110 and the transmission path coupling unit 108 constitute a transmission system (transmission unit: transmission side communication unit).

  The transmission-side signal generation unit 110 includes a multiplexing processing unit 113, a parallel-serial conversion unit 114, a modulation unit 115, a frequency conversion unit 116, and an amplification unit 117 in order to perform signal processing on the input signal to generate a millimeter wave signal. Have. The amplifying unit 117 is an example of an amplitude adjusting unit that adjusts and outputs the magnitude of an input signal. Note that the modulation unit 115 and the frequency conversion unit 116 may be combined into a so-called direct conversion system.

  The multiplexing processing unit 113 performs time division multiplexing, frequency division multiplexing, code processing, when there are a plurality of types (N1) of signals to be communicated in the millimeter wave band among the signals from the LSI function unit 104. By performing multiplexing processing such as division multiplexing, a plurality of types of signals are combined into one system signal. For example, a plurality of types of signals that are required to be high speed and large capacity are collected into one system of signals as targets of transmission using millimeter waves.

  The parallel / serial conversion unit 114 converts the parallel signal into a serial data signal and supplies the serial data signal to the modulation unit 115. The modulation unit 115 modulates the transmission target signal and supplies it to the frequency conversion unit 116. The parallel-serial conversion unit 114 is provided in the case of the parallel interface specification using a plurality of signals for parallel transmission when this embodiment is not applied, and is not required in the case of the serial interface specification.

  The modulation unit 115 may basically be any unit that modulates at least one of amplitude, frequency, and phase with a transmission target signal, and any combination of these may be employed. For example, analog modulation methods include amplitude modulation (AM) and vector modulation, for example. Vector modulation includes frequency modulation (FM) and phase modulation (PM). In the case of a digital modulation method, for example, amplitude transition modulation (ASK: Amplitude shift keying), frequency transition modulation (FSK: Frequency Shift Keying), phase transition modulation (PSK: Phase Shift Keying), amplitude phase for modulating amplitude and phase There is modulation (APSK: Amplitude Phase Shift Keying). As amplitude phase modulation, quadrature amplitude modulation (QAM: Quadrature Amplitude Modulation) is typical.

  The frequency conversion unit 116 frequency-converts the transmission target signal after being modulated by the modulation unit 115 to generate a millimeter-wave electric signal and supplies it to the amplification unit 117. The millimeter-wave electrical signal refers to an electrical signal having a frequency approximately in the range of 30 to 300 gigahertz [GHz]. The term “substantially” may be a frequency at which the effect of millimeter wave communication can be obtained, and the lower limit is not limited to 30 GHz, and the upper limit is not limited to 300 GHz.

  Although various circuit configurations can be employed as the frequency conversion unit 116, for example, a configuration including a frequency mixing circuit (mixer circuit) and a local oscillation circuit may be employed. The local oscillation circuit generates a carrier wave (carrier signal, reference carrier wave) used for modulation. The frequency mixing circuit multiplies (modulates) the millimeter-wave band carrier wave generated by the local oscillation circuit with the signal from the parallel-serial conversion unit 114 to generate a millimeter-wave band transmission signal and supplies it to the amplification unit 117.

  The amplifying unit 117 amplifies the millimeter wave electric signal after frequency conversion and supplies the amplified signal to the transmission line coupling unit 108. The amplifying unit 117 is connected to the bidirectional transmission line coupling unit 108 via an antenna terminal (not shown).

  The transmission path coupling unit 108 transmits the millimeter wave signal generated by the transmission side signal generation unit 110 to the wireless signal transmission path 9. The transmission line coupling unit 108 includes an antenna coupling unit. The antenna coupling unit constitutes an example or a part of the transmission path coupling unit 108 (signal coupling unit). The antenna coupling part means a part for coupling an electronic circuit in a semiconductor chip and an antenna arranged inside or outside the chip in a narrow sense. In a broad sense, a signal is transmitted between the semiconductor chip and the radio signal transmission path 9. The part to be joined. For example, the antenna coupling unit includes at least an antenna structure. The antenna structure refers to a structure at a coupling portion with the wireless signal transmission path 9 and may be any structure that converts a millimeter-wave band electrical signal into an electromagnetic wave (radio wave) and couples it to the wireless signal transmission path 9, and only the antenna itself. Does not mean.

  The radio signal transmission path 9 may be configured as a free space transmission path that propagates through a space in the housing, for example. Preferably, it is composed of a waveguide structure such as a waveguide, a transmission line, a dielectric line, a dielectric body, etc., and has a characteristic of efficiently transmitting an electromagnetic wave in the millimeter wave band in a transmission line. It is desirable to do. For example, the dielectric transmission line 9A may be configured to include a dielectric material having a specific dielectric constant in a certain range and a dielectric loss tangent in a certain range. For example, a dielectric material 9A is disposed between the transmission line coupling unit 108 and the transmission line coupling unit 208 instead of the free space transmission line by filling a dielectric material throughout the housing. Further, the dielectric transmission line 9A is connected by connecting the antenna of the transmission line coupling unit 108 and the antenna of the transmission line coupling unit 208 with a dielectric line which is a linear member having a certain wire diameter made of a dielectric material. May be configured. As the radio signal transmission line 9 configured to confine the millimeter wave signal in the transmission line, in addition to the dielectric transmission line 9A, the transmission line may be surrounded by a shielding material and the inside thereof may be a hollow waveguide. .

[Second communication device]
In the second communication device 200, a semiconductor chip 203 and a transmission path coupling unit 208 that support millimeter wave band reception are mounted on a substrate 202. The semiconductor chip 203 is an LSI in which an LSI function unit 204 and a signal generation unit 207 (millimeter wave signal generation unit) are integrated. Although not shown, like the first communication device 100, the LSI function unit 204 and the signal generation unit 207 may not be integrated.

  The semiconductor chip 203 is connected to a transmission line coupling unit 208 similar to the transmission line coupling unit 108. The transmission path coupling unit 208 is an example of a receiving unit that converts a radio signal transmitted through the radio signal transmission path 9 into an electrical signal. The transmission path coupling unit 208 is similar to the transmission path coupling unit 108 and is used as a radio signal transmission path. 9 receives a millimeter-wave band radio signal, converts it into an electrical signal, and outputs it to the reception-side signal generator 220. A coupling point between the transmission path coupling unit 208 and the wireless signal transmission path 9 is a reception point.

  The signal generation unit 207 (electrical signal conversion unit) includes a reception-side signal generation unit 220 for performing signal reception control via the wireless signal transmission path 9. The reception side signal generation unit 220 and the transmission path coupling unit 208 constitute a reception system (reception unit: reception side communication unit).

  The reception-side signal generation unit 220 performs signal processing on the millimeter-wave electrical signal received by the transmission path coupling unit 208 to generate an output signal, so that an amplification unit 224, a frequency conversion unit 225, a demodulation unit 226, serial parallel conversion A unit 227 and a unification processing unit 228. The amplifying unit 224 is an example of an amplitude adjusting unit that adjusts and outputs the magnitude of an input signal. The frequency converter 225 and the demodulator 226 may be combined into a so-called direct conversion system.

  A reception-side signal generation unit 220 is connected to the transmission line coupling unit 208. The receiving-side amplifying unit 224 is connected to the transmission line coupling unit 208, amplifies the millimeter-wave electrical signal received by the antenna, and supplies the amplified signal to the frequency converting unit 225. The frequency converter 225 performs frequency conversion on the amplified millimeter-wave electrical signal and supplies the frequency-converted signal to the demodulator 226. The demodulator 226 demodulates the frequency-converted signal, acquires a baseband signal, and supplies the baseband signal to the serial-parallel converter 227.

  The serial / parallel conversion unit 227 converts serial reception data into parallel output data and supplies the parallel output data to the unification processing unit 228. Similar to the parallel-serial conversion unit 114, the serial-parallel conversion unit 227 is provided in the case of a parallel interface specification using a plurality of signals for parallel transmission when this embodiment is not applied. When the original signal transmission between the first communication device 100 and the second communication device 200 is in the serial format, the parallel-serial conversion unit 114 and the real-parallel conversion unit 227 need not be provided.

  When the original signal transmission between the first communication device 100 and the second communication device 200 is in parallel format, the input signal is parallel-serial converted and transmitted to the semiconductor chip 203 side, and received from the semiconductor chip 203 side. The number of signals subject to millimeter wave conversion is reduced by serial-parallel conversion of the signals.

  The unification processing unit 228 corresponds to the multiplexing processing unit 113, and separates signals collected in one system into a plurality of types of signals _ @ (@ is 1 to N). For example, a plurality of data signals collected in one system of signals are separated and supplied to the LSI function unit 204.

  The LSI function unit 204 controls the main application of the second communication device 200, and includes, for example, a circuit that processes various signals received from the other party.

[Support for two-way communication]
The signal generation unit 107 and the transmission path coupling unit 108, and the signal generation unit 207 and the transmission path coupling unit 208 are configured to have bidirectional data so that bidirectional communication can be supported. For example, the signal generation unit 107 and the signal generation unit 207 are each provided with a reception-side signal generation unit and a transmission-side signal generation unit. The transmission path coupling unit 108 and the transmission path coupling unit 208 may be provided separately on the transmission side and the reception side, but can also be used for transmission and reception.

  In the “bidirectional communication” shown here, the wireless signal transmission path 9 which is a millimeter-wave transmission channel is one-line (one-core) single-core bidirectional transmission. To realize this, it is conceivable to apply a half-duplex method that applies time division multiplexing (TDD), frequency division multiplexing (FDD), or the like. In this embodiment, frequency division multiplexing is used. Adopt multiple.

[Connection and operation]
The technique of frequency-converting an input signal and transmitting the signal is generally used in broadcasting and wireless communication. In these applications, it is possible to deal with problems such as how far you can communicate (S / N problem against thermal noise), how to cope with reflection and multipath, how to suppress interference and interference with other channels, etc. Such relatively complicated transmitters and receivers are used.

  On the other hand, the signal generation unit 107 and the signal generation unit 207 used in the present embodiment are higher in frequency than the frequency used by complicated transmitters and receivers generally used in broadcasting and wireless communication. Since the millimeter-wave band is mainly used, the wavelength λ is short, so that the frequency can be easily reused, and a device suitable for communication between many devices arranged in the vicinity is used.

  In the present embodiment, unlike the signal interface using the conventional electrical wiring, the signal transmission is performed in the millimeter wave band as described above, so that high speed and large capacity can be flexibly dealt with. For example, only signals that require high speed and large capacity are targeted for communication in the millimeter wave band. Depending on the device configuration, the first communication device 100 and the second communication device 200 may be used for low-speed and small-capacity signals. In addition, for power supply, an interface (connection by a terminal / connector) using a conventional electric wiring is provided in part.

  The signal generation unit 107 is an example of a signal processing unit that performs predetermined signal processing. In this example, the input signal input from the LSI function unit 104 is signal-processed to generate a millimeter wave signal. The signal generation unit 107 is connected to the transmission line coupling unit 108 via a transmission line such as a microstrip line, a strip line, a coplanar line, or a slot line, and the generated millimeter wave signal is transmitted via the transmission line coupling unit 108. The radio signal transmission path 9 is supplied as electromagnetic waves (radio waves, radio signals).

  The transmission path coupling unit 108 has an antenna structure, and has a function of converting a transmitted millimeter wave signal into an electromagnetic wave and transmitting the electromagnetic wave. The transmission path coupling unit 108 is coupled to the radio signal transmission path 9, and an electromagnetic wave converted by the transmission path coupling unit 108 is supplied to one end of the radio signal transmission path 9. A transmission path coupling unit 208 on the second communication device 200 side is coupled to the other end of the wireless signal transmission path 9. By providing the wireless signal transmission line 9 between the transmission line coupling unit 108 on the first communication device 100 side and the transmission line coupling unit 208 on the second communication device 200 side, the wireless signal transmission line 9 has a millimeter wave band as the main. The electromagnetic wave to propagate.

  The wireless signal transmission path 9 is coupled with a transmission path coupling unit 208 on the second communication device 200 side. The transmission path coupling unit 208 receives the electromagnetic wave transmitted to the other end of the wireless signal transmission path 9, converts it to a millimeter wave signal, and supplies it to the signal generation unit 207 (baseband signal generation unit). The signal generation unit 207 is an example of a signal processing unit that performs predetermined signal processing. In this example, the converted millimeter wave signal is signal-processed to generate an output signal (baseband signal) and an LSI function To the unit 204.

  Up to this point, the signal transmission from the first communication device 100 to the second communication device 200 has been described. However, by configuring the first communication device 100 and the second communication device 200 to support bidirectional communication, Similarly, when transmitting a signal from the LSI function unit 204 of the second communication device 200 to the first communication device 100, a millimeter-wave signal can be transmitted in both directions.

  Next, when a plurality of combinations of modulation circuits and demodulation circuits are provided in the same communication area and simultaneous communication is performed using different carrier frequencies in each of the combinations of the modulation circuit and the demodulation circuit, A method of the present embodiment that deals with the aspect of the arrangement of the carrier frequencies without adding or changing will be described.

<3-band frequency arrangement>
2 and 3 are diagrams for explaining a method for determining a frequency arrangement when three carrier frequencies F_1, F_2, and F_3 having different frequencies are used (referred to as three bands). Here, FIG. 2 shows a first example of a three-band frequency arrangement, and FIG. 3 shows a second example of a three-band frequency arrangement.

  For convenience of explanation, the frequency level is assumed to be F_1 <F_2 <F_3. That is, among the three carrier frequencies F_1, F_2, and F_3, the lowest carrier frequency F_L is the carrier frequency F_1, the intermediate carrier frequency F_M is the carrier frequency F_2, and the highest carrier frequency F_H is The carrier frequency is F_3.

  A frequency difference (= F_2−F_1) between the carrier frequency F_1 and the carrier frequency F_2 is D12, and a frequency difference (= F_3−F_2) between the carrier frequency F_2 and the carrier frequency F_3 is D23. That is, the first frequency difference Δ1 obtained as a difference between the lowest carrier frequency F_L (= F_1) of the three carrier frequencies F_1, F_2, and F_3 and the intermediate carrier frequency F_M (= F_2) is D12, the second frequency difference obtained as the difference between the highest carrier frequency F_H (= F_3) of the three carrier frequencies F_1, F_2, and F_3 and the intermediate carrier frequency F_M (= F_2) Δ2 is D23.

  Let Bw1 be the total reception bandwidth of the modulated signal based on the carrier frequency F_1, let Bw1_L be the low-band reception bandwidth of the total reception bandwidth Bw1, and Bw1_H be the high-band reception bandwidth. Let Bw2 be the total reception bandwidth of the modulated signal based on the carrier frequency F_2, let Bw2_L be the low-band reception bandwidth and Bw2_H the high-band reception bandwidth among all the reception bandwidths Bw2. Let Bw3 be the total reception bandwidth of the modulated signal based on the carrier frequency F_3, let Bw3_L be the low-band reception bandwidth and Bw3_H the high-band reception bandwidth among all the reception bandwidths Bw3.

  The band interval between the modulation signal based on the carrier frequency F_1 and the modulation signal based on the carrier frequency F_2 is H12, and the band interval between the modulation signal based on the carrier frequency F_2 and the modulation signal based on the carrier frequency F_3 is H23. In formula, the band interval H12 is “D12−Bw1_H−Bw2_L”, and the band interval H23 is “D23−Bw2_H−Bw3_L”.

  Among the third-order intermodulation distortion components generated based on the carrier frequency F_1 and the carrier frequency F_2, the distortion frequency (= 2F_1−F_2) of the low frequency component (component on the low frequency side) is IM12, and the high frequency component ( The distortion frequency (= 2F_2−F_1) of the high frequency component) is IM21. Among the third-order intermodulation distortion components generated based on the carrier frequency F_2 and the carrier frequency F_3, the distortion frequency (= 2F_2−F_3) of the low frequency component (low frequency component) is IM23, and the high frequency component ( The distortion frequency (= 2F_3−F_2) of the high frequency component) is IM32.

[First example]
The first example is a case of D12 <D23, and the relationship between the three carrier frequencies F_1, F_2, F_3 and the third-order intermodulation distortion frequencies IM12, IM21, IM23, IM32 in this case is shown in FIG.

  In this case, the smaller one ΔS of the first frequency difference Δ1 (= D12) and the second frequency difference Δ2 (= D23) is the first frequency difference Δ1 (= D12). The low-frequency side carrier frequency F_a that defines this smaller ΔS (= D12) is the carrier frequency F_1, and the reception bandwidth F_a_U on the high frequency side of the modulated signal based on this carrier frequency F_a (= F_1) is Bw1_H. . Further, the carrier frequency F_b on the high band side that defines the smaller one ΔS (= D12) is the carrier frequency F_2, and the reception bandwidth F_b_L on the low band side of the modulated signal based on the carrier frequency F_b (= F_2) is Bw2_L. It is.

  Here, for the three carrier frequencies F_1, F_2, and F_3, the bands of the modulation signals based on the respective carrier frequencies do not overlap with each other and are generated on the basis of the two adjacent carrier frequencies (here, When the condition for the fact that the frequency of the (third order) intermodulation distortion component does not exist in any band of the modulation signal based on each carrier frequency is obtained, it is as follows.

  In order not to overlap each band of the modulation signal based on each carrier frequency, the modulation signal based on the carrier frequency F_1 and the modulation signal based on the carrier frequency F_1 are expressed as shown in Expression (1) (Expression (1-1) and Expression (1-2)). The band interval H12 between the modulation signal based on the carrier frequency F_2 needs to be a positive value, and the band interval H23 between the modulation signal based on the carrier frequency F_2 and the modulation signal based on the carrier frequency F_3 needs to be a positive value. (See FIG. 2A).

  Among the third-order intermodulation distortion components generated based on the carrier frequency F_1 and the carrier frequency F_2, the distortion frequency IM12 of the low frequency component exists on the lower frequency side than the carrier frequency F_1, so that the problem of interference does not occur. (See FIG. 2 (B)).

  On the other hand, among the third-order intermodulation distortion components generated based on the carrier frequency F_1 and the carrier frequency F_2, the high-frequency component distortion frequency IM21 exists on the higher frequency side than the carrier frequency F_2. Interference can occur due to overlap with the underlying modulation signal. In order to prevent this, it is sufficient that the distortion frequency IM21 does not occur in the band of the modulation signal based on the carrier frequency F_3. As shown in the equation (2), the modulation based on the distortion frequency IM21 and the carrier frequency F_3 is performed. It is necessary that the interval H2 with the lower band of the signal be a positive value (see FIG. 2B).

  Among the third-order intermodulation distortion components generated based on the carrier frequency F_2 and the carrier frequency F_3, the distortion frequency IM32 of the high frequency component exists on the higher frequency side than the carrier frequency F_3, so that the problem of interference does not occur. (See FIG. 2C).

  On the other hand, the distortion frequency IM23 of the low-frequency component among the third-order intermodulation distortion components generated based on the carrier frequency F_2 and the carrier frequency F_3 is present on the lower frequency side than the carrier frequency F_1. Interference can occur due to overlap with the underlying modulation signal. In order to prevent this, it is sufficient that the distortion frequency IM23 does not occur in the band of the modulation signal based on the carrier frequency F_1. As shown in the equation (3), the modulation based on the distortion frequency IM23 and the carrier frequency F_1 is performed. It is necessary that the interval H3 with the lower band of the signal be a positive value (see FIG. 2C).

  From the equations (1), (2), and (3), the first frequency difference Δ1 (= D12) obtained as the difference between the carrier frequency F_L (= F_1) and the carrier frequency F_M (= F_2) is It is defined in the range indicated by (4).

  “Bw1_H + Bw2_L <D12” in the expression (4) corresponds to the above-described condition 1. In Expression (4), “D12 <D23− (the larger one of Bw1_L and Bw3_L)” can be transformed to “| D12−D23 |> (the larger one of Bw1_L and Bw3_L)”, which is the condition 2 described above. And corresponding.

  Therefore, by determining the frequency arrangement of the three carrier frequencies F_1, F_2, and F_3 so as to satisfy Equation (4), the receiver amplifier and the frequency mixing unit (mixer) can be used without using a band-select filter with high selectivity. The linear performance such as the above can be relaxed, and cost reduction, power consumption reduction, circuit scale reduction, and the like can be performed.

  When Bw1_L = Bw1_H, Bw1_L = Bw1_H = Bw1 / 2, when Bw2_L = Bw2_H, Bw2_L = Bw2_H = Bw2 / 2, and when Bw3_L = Bw3_H, Bw3_L = Bw3_H = Bw3_H = Bw3_H Equation (1-1) can be transformed into Equation (5-1), Equation (1-2) can be transformed into Equation (5-2), Equation (2) can be transformed into Equation (5-3), Equation (3) can be transformed into Equation (5-4), and Equation (4) can be transformed into Equation (5-5). Furthermore, when all the bands of the modulation signals are equally Bw (= Bw1 = Bw2 = Bw3), the equation (5-5) can be simplified as the equation (5-6).

[Second example]
The second example is a case of D12> D23, and the relationship between the three carrier frequencies F_1, F_2, F_3 and the third-order intermodulation distortion frequencies IM12, IM21, IM23, IM32 in this case is shown in FIG.

  In this case, the smaller one ΔS of the first frequency difference Δ1 (= D12) and the second frequency difference Δ2 (= D23) is the second frequency difference Δ2 (= D23). The low-frequency side carrier frequency F_a that defines this smaller ΔS (= D23) is the carrier frequency F_2, and the reception bandwidth F_a_U on the high frequency side of the modulated signal based on this carrier frequency F_a (= F_2) is Bw2_H. . Further, the carrier frequency F_b on the high band side that defines the smaller ΔS (= D23) is the carrier frequency F_3, and the reception bandwidth F_b_L on the low band side of the modulation signal based on the carrier frequency F_b (= F_3) is Bw3_L. It is.

  Here, for the three carrier frequencies F_1, F_2, and F_3, the bands of the modulation signals based on the respective carrier frequencies do not overlap with each other and are generated on the basis of the two adjacent carrier frequencies (here, When the condition for the fact that the frequency of the (third order) intermodulation distortion component does not exist in any band of the modulation signal based on each carrier frequency is obtained, it is as follows.

  In order not to overlap each band of the modulation signal based on each carrier frequency, as shown in Expression (6) (Expression (6-1) and Expression (6-2)), the modulation signal based on the carrier frequency F_1 The band interval H12 between the modulation signal based on the carrier frequency F_2 needs to be a positive value, and the band interval H23 between the modulation signal based on the carrier frequency F_2 and the modulation signal based on the carrier frequency F_3 needs to be a positive value. (See FIG. 3A).

  Among the third-order intermodulation distortion components generated based on the carrier frequency F_1 and the carrier frequency F_2, the distortion frequency IM12 of the low frequency component exists on the lower frequency side than the carrier frequency F_1, so that the problem of interference does not occur. (See FIG. 3B).

  On the other hand, the distortion frequency IM21 of the high-frequency component among the third-order intermodulation distortion components generated based on the carrier frequency F_1 and the carrier frequency F_2 is present on the higher frequency side than the carrier frequency F_3. Interference can occur due to overlap with the underlying modulation signal. In order to prevent this, it is sufficient that the distortion frequency IM21 does not occur in the band of the modulation signal based on the carrier frequency F_3. As shown in the equation (7), the modulation based on the distortion frequency IM21 and the carrier frequency F_3 is performed. It is necessary that the interval H5 with the high frequency band of the signal be a positive value (see FIG. 3B).

  Among the third-order intermodulation distortion components generated based on the carrier frequency F_2 and the carrier frequency F_3, the distortion frequency IM32 of the high frequency component exists on the higher frequency side than the carrier frequency F_3, so that the problem of interference does not occur. (See FIG. 3C).

  On the other hand, of the third-order intermodulation distortion components generated based on the carrier frequency F_2 and the carrier frequency F_3, the low-frequency component distortion frequency IM23 exists on the lower frequency side than the carrier frequency F_2, and the carrier frequency F_1 Interference can occur due to overlap with the underlying modulation signal. In order to prevent this, it is sufficient that the distortion frequency IM23 does not occur in the band of the modulation signal based on the carrier frequency F_1. As shown in the equation (8), the modulation based on the distortion frequency IM23 and the carrier frequency F_1 is performed. It is necessary that the interval H6 with the high frequency band of the signal be a positive value (see FIG. 3C).

  From the equations (6), (7), and (8), the second frequency difference Δ2 (= D23) obtained as the difference between the carrier frequency F_H (= F_3) and the carrier frequency F_M (= F_2) is It is defined in the range indicated by (9).

  “Bw2_H + Bw3_L <D23” in the equation (9) corresponds to the above-described condition 1. In Expression (9), “D23 <D12− (the larger one of Bw1_H and Bw3_H)” can be transformed to “| D12−D23 |> (the larger one of Bw1_H and Bw3_H)”, which is the condition 3 described above. And corresponding.

  Therefore, by determining the frequency arrangement of the three carrier frequencies F_1, F_2, and F_3 so as to satisfy Equation (9), the receiver amplifier and the frequency mixing unit (mixer) can be used without using a band select filter with high selectivity. The linear performance such as the above can be relaxed, and cost reduction, power consumption reduction, circuit scale reduction, and the like can be performed.

  When Bw1_L = Bw1_H, Bw1_L = Bw1_H = Bw1 / 2, when Bw2_L = Bw2_H, Bw2_L = Bw2_H = Bw2 / 2, and when Bw3_L = Bw3_H, Bw3_L = Bw3_H = Bw3_H = Bw3_H Equation (6-1) can be transformed into Equation (10-1), Equation (6-2) can be transformed into Equation (10-2), Equation (7) can be transformed into Equation (10-3), Equation (8) can be transformed into Equation (10-4), and Equation (9) can be transformed into Equation (10-5). Furthermore, when all the bands of the modulated signals are equally Bw (= Bw1 = Bw2 = Bw3), the equation (10-5) can be simplified as the equation (10-6).

  Thus, by determining the frequency arrangement of the three carrier frequencies F_1, F_2, and F_3 so as to satisfy Equation (4) or Equation (9), the influence of the Nth order (here, third order) intermodulation distortion can be reduced. Can be avoided. Therefore, for example, a high-selectivity band-limiting filter is not required, a small-sized receiver can be configured at low cost, and the distortion performance of the receiver can be relaxed, and a small-sized and low-power receiver can be configured. .

<Four-band frequency arrangement>
4 and 5 are diagrams for explaining a method of determining a frequency arrangement when four carrier frequencies having different frequencies are used (referred to as four bands). Here, FIG. 4 shows a first example of a 4-band frequency arrangement, and FIG. 5 shows a second example of a 4-band frequency arrangement.

  For the four carrier frequencies, the bands of modulation signals based on the respective carrier frequencies do not overlap with each other, and the Nth-order (third-order here) intermodulation distortion component generated based on two adjacent carrier frequencies The condition for the frequency to be not present in any of the modulation signal bands based on each carrier frequency is newly added to the lower side or the higher side based on the frequency arrangement determined at the time of 3 bands The three-band frequency arrangement determination method may be similarly applied to three adjacent carrier frequencies including the fourth carrier frequency. This will be specifically described below.

[First example]
The first example is a mode in which a fourth carrier frequency is newly added on the higher frequency side based on the first example of the three-band frequency arrangement. The fourth carrier frequency is F_4, and the frequency is F_1 <F_2 <F_3 <F_4. Then, the three-band frequency arrangement determination method is similarly applied to the three carrier frequencies F_2, F_3, and F_4.

  Of the three carrier frequencies F_2, F_3, and F_4, the lowest carrier frequency F_L is the carrier frequency F_2, the intermediate carrier frequency F_M is the carrier frequency F_3, and the highest carrier frequency F_H is the carrier frequency. F_4.

  A frequency difference (= F_4−F_3) between the carrier frequency F_3 and the carrier frequency F_4 is set to D34. The first frequency difference Δ1 obtained as the difference between the lowest carrier frequency F_L (= F_2) of the three carrier frequencies F_2, F_3, and F_4 and the intermediate carrier frequency F_M (= F_3) is D23. Yes, the second frequency difference Δ2 obtained as the difference between the highest carrier frequency F_H (= F_4) of the three carrier frequencies F_2, F_3, and F_4 and the intermediate frequency carrier frequency F_M (= F_3) is D34.

  Let Bw4 be the total reception bandwidth of the modulated signal based on the carrier frequency F_4, and let Bw4_L be the low-band reception bandwidth and Bw4_H the high-band reception bandwidth among the total reception bandwidth Bw4. The band interval between the modulated signal based on the carrier frequency F_3 and the modulated signal based on the carrier frequency F_4 is set to H34. Mathematically, the band interval H34 is “D34−Bw3_H−Bw4_L”.

  Of the third-order intermodulation distortion components generated based on the carrier frequency F_3 and the carrier frequency F_4, the distortion frequency (= 2F_3-F_4) of the low frequency component (low frequency component) is IM34, and the high frequency component ( The distortion frequency (= 2F_4−F_3) of the high frequency component) is IM43.

  In these cases, regarding the frequency arrangement of the three carrier frequencies F_2, F_3, and F_4, the determination method of the second example of the three-band frequency arrangement may be similarly applied as D23> D34.

  Although the detailed description is omitted, the second frequency difference Δ2 (= D34) obtained as the difference between the carrier frequency F_H (= F_4) and the carrier frequency F_M (= F_3) is obtained by changing the equation (9) It is defined in the range indicated by (11).

  “Bw3_H + Bw4_L <D34” in the expression (11) corresponds to the condition 1 described above. In Expression (11), “D34 <D23− (the larger one of Bw2_H and Bw4_H)” can be transformed to “| D23−D34 |> (the larger one of Bw2_H and Bw4_H)”, which is the condition 3 described above. And corresponding.

  Therefore, the frequency arrangement of the three carrier frequencies F_1, F_2, and F_3 is determined so as to satisfy Expression (4), and the frequency arrangement of the three carrier frequencies F_2, F_3, and F_4 is determined so as to satisfy Expression (11).

  Of the three carrier frequencies F_2, F_3, and F_4, the lowest of the third-order intermodulation waves generated based on the lowest carrier frequency F_L (= F_2) and the intermediate carrier frequency F_M (= F_3) The third-order intermodulation wave (distortion frequency IM23) generated on the lower frequency side than the low frequency carrier frequency F_L (= F_2) is lower than the lowest frequency carrier frequency F_L (= F_2). It does not exist in the band of the modulation signal based on (= F_1). That is, the fourth condition is satisfied.

  Among the three carrier frequencies F_1, F_2, and F_3, the third-order intermodulation wave generated based on the highest carrier frequency F_H (= F_3) and the intermediate carrier frequency F_M (= F_2). The third-order intermodulation wave (distortion frequency IM32) generated on the higher frequency side than the highest carrier frequency F_H (= F_3) is higher than the highest frequency carrier frequency F_H (= F_3). It does not exist in the band of the modulation signal based on the carrier frequency (= F_4). That is, the fifth condition is satisfied.

  As a result, like the three-band frequency arrangement, linear performance of a receiver amplifier, a frequency mixing unit (mixer), etc. can be relaxed without using a high-selectivity band-limiting filter, thereby reducing cost and power consumption. Reduction, circuit scale reduction, and the like can be performed.

  When Bw4_L = B4_H, since Bw4_L = Bw4_H = Bw4 / 2, equation (11) can be transformed into equation (12-1). Furthermore, when all the bands of the modulated signals are equally Bw (= Bw1 = Bw2 = Bw3 = Bw4), the equation (12-1) can be simplified as the equation (12-2), When D12 = D34, the equation (12-2) can be transformed into the equation (12-3).

[Second example]
The second example is a mode in which the fourth carrier frequency is newly added to the lower frequency side based on the second example of the three-band frequency arrangement. The fourth carrier frequency is F_0, and the frequency is F_0 <F_1 <F_2 <F_3. The three-band frequency arrangement determination method is similarly applied to the three carrier frequencies F_0, F_1, and F_2.

  Of the three carrier frequencies F_0, F_1, and F_2, the lowest carrier frequency F_L is the carrier frequency F_0, the intermediate carrier frequency F_M is the carrier frequency F_1, and the highest carrier frequency F_H is the carrier frequency. F_2.

  A frequency difference (= F_1−F_0) between the carrier frequency F_0 and the carrier frequency F_1 is set to D01. The first frequency difference Δ1 obtained as the difference between the lowest carrier frequency F_L (= F_0) of the three carrier frequencies F_0, F_1 and F_2 and the intermediate frequency carrier frequency F_M (= F_1) is D01. Yes, the second frequency difference Δ2 obtained as the difference between the highest carrier frequency F_H (= F_2) of the three carrier frequencies F_0, F_1, and F_2 and the intermediate frequency carrier frequency F_M (= F_1) is D12.

  The total reception bandwidth of the modulated signal based on the carrier frequency F_0 is Bw0, and among the total reception bandwidths Bw0, the low-band reception bandwidth is Bw0_L and the high-band reception bandwidth is Bw0_H. Let H01 be the band interval between the modulated signal based on the carrier frequency F_0 and the modulated signal based on the carrier frequency F_1. Mathematically, the band interval H01 is “D01−Bw0_H−Bw1_L”.

  Of the third-order intermodulation distortion components generated based on the carrier frequency F_0 and the carrier frequency F_1, the distortion frequency (= 2F_0−F_1) of the low frequency component (low frequency component) is IM01, and the high frequency component ( The distortion frequency (= 2F_1−F_0) of the high frequency component) is IM10.

  In these cases, regarding the frequency arrangement of the three carrier frequencies F_0, F_1, and F_2, the determination method of the first example of the three-band frequency arrangement may be similarly applied as D01 <D12.

  Although a detailed description is omitted, the first frequency difference Δ1 (= D01) obtained as the difference between the carrier frequency F_L (= F_0) and the carrier frequency F_M (= F_1) is expressed as a modification of the equation (4). It is specified in the range indicated by (13).

  “Bw0_H + Bw1_L <D01” in the expression (13) corresponds to the above-described condition 1. In Expression (13), “D01 <D12− (the larger of Bw0_L and Bw2_L)” can be transformed to “| D01−D12 |> (the larger of Bw0_L and Bw2_L)”, which is the condition 2 described above. And corresponding.

  Therefore, the frequency arrangement of the three carrier frequencies F_1, F_2, and F_3 is determined so as to satisfy Expression (9), and the frequency arrangement of the three carrier frequencies F_0, F_1, and F_2 is determined so as to satisfy Expression (13).

  Among the three carrier frequencies F_1, F_2 and F_3, the lowest of the third-order intermodulation waves generated based on the lowest carrier frequency F_L (= F_1) and the intermediate carrier frequency F_M (= F_2). The third-order intermodulation wave (distortion frequency IM12) generated on the lower frequency side than the low frequency carrier frequency F_L (= F_1) is the lower carrier frequency than the lowest frequency carrier frequency F_L (= F_1). It does not exist in the band of the modulation signal based on (= F_0).

  Of the three-order intermodulation waves generated based on the highest carrier frequency F_H (= F_2) and the intermediate carrier frequency F_M (= F_1) among the three carrier frequencies F_0, F_1 and F_2. The third-order intermodulation wave (distortion frequency IM21) generated on the higher frequency side than the highest carrier frequency F_H (= F_2) is higher than the highest frequency carrier frequency F_H (= F_2). It does not exist in the band of the modulation signal based on the carrier frequency (= F_3).

  As a result, like the three-band frequency arrangement, linear performance of a receiver amplifier, a frequency mixing unit (mixer), etc. can be relaxed without using a high-selectivity band-limiting filter, thereby reducing cost and power consumption. Reduction, circuit scale reduction, and the like can be performed.

  When Bw0_L = Bw0_H, since Bw0_L = Bw0_H = Bw0 / 2, equation (13) can be transformed into equation (14-1). Furthermore, when all the bands of the modulated signals are equally Bw (= Bw0 = Bw1 = Bw2 = Bw3), the equation (14-1) can be simplified as the equation (14-2), When D01 = D23, the equation (14-2) can be transformed into the equation (14-3).

<Frequency arrangement of 5 bands>
6 and 7 are diagrams for explaining a method for determining a frequency arrangement when five carrier frequencies having different frequencies are used (referred to as five bands). 6 shows a first example of a 5-band frequency arrangement, and FIG. 7 shows a second example of a 5-band frequency arrangement.

  N-order (here, third-order) intermodulation distortion components generated on the basis of two adjacent carrier frequencies, and the bands of the modulation signals based on the respective carrier frequencies do not overlap each other for the five carrier frequencies. The condition for the frequency of 1 to not exist in any of the modulation signal bands based on each carrier frequency is newly added to the lower side or higher side based on the frequency arrangement determined at the time of 4 bands The three-band frequency arrangement determining method may be similarly applied to three adjacent carrier frequencies including the fifth carrier frequency.

  This will be specifically described below. For convenience of explanation of the magnitude relationship between frequencies, a modification example based on the first example of the 4-band frequency arrangement will be described.

[First example]
The first example is a mode in which a fifth carrier frequency is newly added on the higher frequency side based on the first example of the frequency arrangement of four bands. The fifth carrier frequency is F_5, and the frequency is high or low. F_1 <F_2 <F_3 <F_4 <F_5. Then, the three-band frequency arrangement determination method is similarly applied to the three carrier frequencies F_3, F_4, and F_5.

  Note that the carrier frequencies F_3, F_4, and F_5 are considered as bands for non-adjacent carrier frequencies, for example, the carrier frequency F_1, and these beats are considered not to interfere with the modulation signal based on the carrier frequency F_1. The same applies to the second example.

  Of the three carrier frequencies F_3, F_4, and F_5, the lowest carrier frequency F_L is the carrier frequency F_3, the intermediate carrier frequency F_M is the carrier frequency F_4, and the highest carrier frequency F_H is the carrier frequency. F_5.

  A frequency difference (= F_5−F_4) between the carrier frequency F_4 and the carrier frequency F_5 is set to D45. The first frequency difference Δ1 obtained as the difference between the lowest carrier frequency F_L (= F_3) of the three carrier frequencies F_3, F_4, and F_5 and the intermediate carrier frequency F_M (= F_4) is D34. Yes, the second frequency difference Δ2 obtained as the difference between the highest carrier frequency F_H (= F_5) of the three carrier frequencies F_3, F_4, and F_5 and the intermediate carrier frequency F_M (= F_4) is D45.

  The total reception bandwidth of the modulated signal based on the carrier frequency F_5 is Bw5. Of the total reception bandwidth Bw5, the low-band reception bandwidth is Bw5_L, and the high-band reception bandwidth is Bw5_H. The band interval between the modulation signal based on the carrier frequency F_4 and the modulation signal based on the carrier frequency F_5 is set to H45. In terms of formula, the band interval H45 is “D45−Bw4_H−Bw5_L”.

  Among the third-order intermodulation distortion components generated based on the carrier frequency F_4 and the carrier frequency F_5, the low frequency component (low frequency side component) distortion frequency (= 2F_4−F_5) is IM45, and the high frequency component ( The distortion frequency (= 2F_5-F_4) of the component on the high frequency side is IM54.

  In these cases, regarding the frequency arrangement of the three carrier frequencies F_3, F_4, and F_5, the determination method of the first example of the three-band frequency arrangement may be similarly applied as D34 <D45.

  Although a detailed description is omitted, a first frequency difference Δ1 (= D34) obtained as a difference between the carrier frequency F_L (= F_3) and the carrier frequency F_M (= F_4) is expressed as a modification of the equation (4). It is specified in the range indicated by (15).

  “Bw3_H + Bw4_L <D34” in the equation (15) corresponds to the above-described condition 1. In Expression (5), “D34 <D45− (the larger of Bw3_L and Bw5_L)” can be transformed to “| D34−D45 |> (the larger of Bw3_L and Bw5_L)”, which is the condition 2 described above. And corresponding.

  Accordingly, the frequency arrangement of the three carrier frequencies F_1, F_2, and F_3 is determined so as to satisfy the equation (4), and the frequency arrangement of the three carrier frequencies F_2, F_3, and F_4 is determined so as to satisfy the equation (11). The frequency arrangement of the carrier frequencies F_3, F_4, and F_5 is determined so as to satisfy Expression (15). As a result, like the three-band frequency arrangement, linear performance of a receiver amplifier, a frequency mixing unit (mixer), etc. can be relaxed without using a high-selectivity band-limiting filter, thereby reducing cost and power consumption. Reduction, circuit scale reduction, and the like can be performed.

  Since Expression (15) defines the range of the frequency difference D34 similarly to Expression (11), the frequency difference D34 must satisfy both Expression (11) and Expression (15) as a result. I must. Therefore, the frequency difference D34 is defined in a range represented by the equation (16) by combining the equations (11) and (15).

  Further, when Bw5_L = B5_H, since Bw5_L = Bw5_H = Bw5 / 2, equation (15) can be transformed into equation (17-1). Furthermore, when all the bands of the modulated signals are equally Bw (= Bw1 = Bw2 = Bw3 = Bw4 = Bw5), Equation (17-1) can be simplified as Equation (17-2) Furthermore, when D12 = D34 and D23 = D45, the equation (17-2) can be transformed into the equation (17-3).

[Second example]
The second example is a mode in which a fifth carrier frequency is newly added on the lower frequency side based on the first example of the frequency arrangement of four bands. The fifth carrier frequency is F_0, and the frequency is high or low. F_0 <F_1 <F_2 <F_3 <F_4. The three-band frequency arrangement determination method is similarly applied to the three carrier frequencies F_0, F_1, and F_2.

  Of the three carrier frequencies F_0, F_1, and F_2, the lowest carrier frequency F_L is the carrier frequency F_0, the intermediate carrier frequency F_M is the carrier frequency F_1, and the highest carrier frequency F_H is the carrier frequency. F_2.

  The frequency and frequency difference are the same as those described in the determination method of the second example of the 4-band frequency arrangement. However, regarding the frequency arrangement of the three carrier frequencies F_0, F_1, and F_2, D01> D12, The determination method of the second example of the frequency arrangement is similarly applied.

  Although a detailed description is omitted, the second frequency difference Δ2 (= D12) obtained as the difference between the carrier frequency F_H (= F_2) and the carrier frequency F_M (= F_1) is expressed as a modification of the equation (9). It is specified in the range indicated by (18).

  “Bw1_H + Bw2_L <D12” in the expression (18) corresponds to the above-described condition 1. In Expression (18), “D12 <D01− (the larger of Bw0_H and Bw2_H)” can be transformed to “| D01−D12 |> (the larger of Bw0_H and Bw2_H)”, which is the condition 2 described above. And corresponding.

  Accordingly, the frequency arrangement of the three carrier frequencies F_1, F_2, and F_3 is determined so as to satisfy the equation (4), and the frequency arrangement of the three carrier frequencies F_2, F_3, and F_4 is determined so as to satisfy the equation (11). The frequency arrangement of the carrier frequencies F_0, F_1, F_2 is determined so as to satisfy the equation (18). As a result, like the three-band frequency arrangement, linear performance of a receiver amplifier, a frequency mixing unit (mixer), etc. can be relaxed without using a high-selectivity band-limiting filter, thereby reducing cost and power consumption. Reduction, circuit scale reduction, and the like can be performed.

  Since Expression (18) defines the range of the frequency difference D12 as in Expression (4), as a result, the frequency difference D34 must satisfy both Expression (4) and Expression (18). I must. Therefore, the frequency difference D34 is defined in a range represented by the equation (19) by combining the equations (4) and (18).

  Further, when Bw0_L = B0_H, since Bw0_L = Bw0_H = Bw0 / 2, equation (18) can be transformed into equation (20-1). Furthermore, when all the bands of the modulated signals are equally Bw (= Bw0 = Bw1 = Bw2 = Bw3 = Bw4), equation (20-1) can be simplified as equation (20-2) Furthermore, when D12 = D34 and D01 = D23, the equation (20-2) can be transformed into the equation (20-3).

  In both the first example and the second example, of the third-order intermodulation waves generated based on the lowest carrier frequency F_L and the intermediate carrier frequency F_M among the three adjacent carrier frequencies. The third-order intermodulation wave generated on the lower frequency side than the lowest frequency carrier frequency F_L does not exist in the band of the modulation signal based on the lower frequency carrier frequency than the lowest frequency carrier frequency F_L. The fourth condition is satisfied. Incidentally, the combination of “adjacent three carrier frequencies” is “F_2, F_3, F_4” or “F_3, F_4, F_5” in the first example, and “F_1, F_2, F_3” in the second example. "Or" F_2, F_3, F_4 ".

  In both the first example and the second example, the third intermodulation wave generated based on the highest carrier frequency F_H and the intermediate carrier frequency F_M among the three carrier frequencies. The third-order intermodulation wave generated on the higher frequency side than the highest frequency carrier frequency F_H is not present in the band of the modulation signal based on the higher frequency carrier frequency than the highest frequency carrier frequency F_H. The fifth condition is also satisfied. Incidentally, the combination of “adjacent three carrier frequencies” is “F_1, F_2, F_3” or “F_2, F_3, F_4” in the first example, and “F_0, F_1, F_2 in the second example”. Or “F_1, F_2, F_3”.

<6-band frequency arrangement>
FIG. 8 and FIG. 9 are diagrams for explaining a method for determining a frequency arrangement when six carrier frequencies having different frequencies are used (referred to as 6 bands). Here, FIG. 8 shows a first example of a 6-band frequency arrangement, and FIG. 9 shows a second example of a 6-band frequency arrangement.

  For the six carrier frequencies, the bands of the modulation signals based on the respective carrier frequencies do not overlap with each other and are generated based on the two adjacent carrier frequencies. The condition for the frequency to be non-existent in any of the modulation signal bands based on each carrier frequency is newly added to the lower side or higher side based on the frequency arrangement determined at the time of 5 bands The three-band frequency arrangement determination method may be similarly applied to three adjacent carrier frequencies including the sixth carrier frequency.

  This will be specifically described below. For convenience of explanation of the magnitude relationship between frequencies, a modification example based on the first example of the 5-band frequency arrangement will be described.

[First example]
The first example is a mode in which a sixth carrier frequency is newly added on the higher frequency side based on the first example of the 5-band frequency arrangement, and the sixth carrier frequency is F_6, and the frequency is high or low. F_1 <F_2 <F_3 <F_4 <F_5 <F_6. Then, the three-band frequency arrangement determination method is similarly applied to the three carrier frequencies F_4, F_5, and F_6.

  Note that the carrier frequencies F_3, F_4, and F_5 are considered as bands for non-adjacent carrier frequencies, for example, the carrier frequency F_1, and these beats are considered not to interfere with the modulation signal based on the carrier frequency F_1. The same applies to the second example.

  Of the three carrier frequencies F_4, F_5, F_6, the lowest carrier frequency F_L is the carrier frequency F_4, the intermediate carrier frequency F_M is the carrier frequency F_5, and the highest carrier frequency F_H is the carrier frequency. F_6.

  A frequency difference (= F_6−F_5) between the carrier frequency F_5 and the carrier frequency F_6 is set to D56. The first frequency difference Δ1 obtained as the difference between the lowest carrier frequency F_L (= F_4) of the three carrier frequencies F_4, F_5 and F_6 and the intermediate carrier frequency F_M (= F_5) is D45. Yes, the second frequency difference Δ2 obtained as the difference between the highest carrier frequency F_H (= F_6) of the three carrier frequencies F_4, F_5 and F_6 and the intermediate frequency carrier frequency F_M (= F_5) is D56.

  Let Bw6 be the total reception bandwidth of the modulated signal based on the carrier frequency F_6, and let Bw6_L be the low-band reception bandwidth and Bw6_H the high-band reception bandwidth among all the reception bandwidths Bw6. The band interval between the modulated signal based on the carrier frequency F_5 and the modulated signal based on the carrier frequency F_6 is set to H56. In terms of formula, the band interval H56 is “D56−Bw5_H−Bw6_L”.

  Of the third-order intermodulation distortion components generated based on the carrier frequency F_5 and the carrier frequency F_6, the distortion frequency (= 2F_5-F_6) of the low frequency component (low frequency side component) is IM56, and the high frequency component ( The distortion frequency (= 2F_6−F_5) of the high frequency component) is IM65.

  In these cases, regarding the frequency arrangement of the three carrier frequencies F_4, F_5, and F_6, the determination method of the second example of the three-band frequency arrangement may be similarly applied as D45> D56.

  Although the detailed description is omitted, the second frequency difference Δ2 (= D56) obtained as the difference between the carrier frequency F_H (= F_6) and the carrier frequency F_M (= F_5) It is defined in the range indicated by (21).

  “Bw5_H + Bw6_L <D56” in the equation (21) corresponds to the condition 1 described above. In Expression (21), “D56 <D45− (the larger of Bw4_H and Bw6_H)” can be transformed to “| D45−D56 |> (the larger of Bw4_H and Bw6_H)”, which is the condition 3 described above. And corresponding.

  Accordingly, the frequency arrangement of the three carrier frequencies F_1, F_2, and F_3 is determined so as to satisfy the equation (4), and the frequency arrangement of the three carrier frequencies F_2, F_3, and F_4 is determined so as to satisfy the equation (11). It is determined that the frequency arrangement of the carrier frequencies F_3, F_4, and F_5 satisfies Expression (15), and the frequency arrangement of the three carrier frequencies F_4, F_5, and F_6 satisfies Expression (21). Alternatively, the frequency arrangement of the three carrier frequencies F_1, F_2, and F_3 is determined so as to satisfy Equation (4), and the frequency arrangement of the four carrier frequencies F_2, F_3, F_4, and F_5 is determined so as to satisfy Equation (16). The frequency arrangement of the three carrier frequencies F_4, F_5, and F_6 is determined so as to satisfy Expression (21). As a result, like the three-band frequency arrangement, linear performance of a receiver amplifier, a frequency mixing unit (mixer), etc. can be relaxed without using a high-selectivity band-limiting filter, thereby reducing cost and power consumption. Reduction, circuit scale reduction, and the like can be performed.

  When Bw6_L = B6_H, since Bw6_L = Bw6_H = Bw6 / 2, equation (21) can be transformed into equation (22-1). Furthermore, when all the bands of the modulated signals are equally Bw (= Bw1 = Bw2 = Bw3 = Bw4 = Bw5 = Bw6), the equation (22-1) can be simplified as the equation (22-2). Furthermore, when D12 = D34 = D56 and D23 = D45, Expression (22-2) can be transformed into Expression (22-3).

[Second example]
The second example is a mode in which a sixth carrier frequency is newly added to the lower frequency side based on the first example of the frequency arrangement of five bands, and the sixth carrier frequency is set to F_0. F_0 <F_1 <F_2 <F_3 <F_4 <F_5. The three-band frequency arrangement determination method is similarly applied to the three carrier frequencies F_0, F_1, and F_2.

  Of the three carrier frequencies F_0, F_1, and F_2, the lowest carrier frequency F_L is the carrier frequency F_0, the intermediate carrier frequency F_M is the carrier frequency F_1, and the highest carrier frequency F_H is the carrier frequency. F_2.

  The frequency and frequency difference are the same as those described in the determination method of the second example of the 4-band frequency arrangement. However, regarding the frequency arrangement of the three carrier frequencies F_0, F_1, and F_2, D01> D12, The determination method of the second example of the frequency arrangement is similarly applied.

  Although a detailed description is omitted, the second frequency difference Δ2 (= D12) obtained as the difference between the carrier frequency F_H (= F_2) and the carrier frequency F_M (= F_1) is expressed as a modification of the equation (9). It is specified in the range indicated by (23).

  In addition, since Formula (23) is the same as Formula (18) and defines the range of the frequency difference D12 similarly to Formula (4) and Formula (18), Formula (4) and Formula (23) are changed. Collectively, it is defined within the range represented by equation (19).

  The three carrier frequencies F_1, F_2, and F_3 are determined to satisfy the equation (4), and the three carrier frequencies F_2, F_3, and F_4 are determined to satisfy the equation (11). The frequency arrangement of F_3, F_4, and F_5 is determined to satisfy Expression (15), and the frequency arrangement of the three carrier frequencies F_0, F_1, and F_2 is determined to satisfy Expression (23). Alternatively, the frequency arrangement of the three carrier frequencies F_1, F_2, and F_3 is determined so as to satisfy Equation (4), and the frequency arrangement of the four carrier frequencies F_2, F_3, F_4, and F_5 is determined so as to satisfy Equation (16). The frequency arrangement of the three carrier frequencies F_0, F_1, and F_2 is determined so as to satisfy Expression (23). As a result, like the three-band frequency arrangement, linear performance of a receiver amplifier, a frequency mixing unit (mixer), etc. can be relaxed without using a high-selectivity band-limiting filter, thereby reducing cost and power consumption. Reduction, circuit scale reduction, and the like can be performed.

  When Bw0_L = B0_H, since Bw0_L = Bw0_H = Bw0 / 2, equation (23) can be transformed into equation (24-1). Furthermore, when all the bands of the modulated signals are equally Bw (= Bw0 = Bw1 = Bw2 = Bw3 = Bw4 = Bw5), the equation (24-1) can be simplified as the equation (24-2). Furthermore, when D12 = D34 and D01 = D23 = D45, Expression (24-2) can be transformed into Expression (24-3).

  In both the first example and the second example, of the third-order intermodulation waves generated based on the lowest carrier frequency F_L and the intermediate carrier frequency F_M among the three adjacent carrier frequencies. The third-order intermodulation wave generated on the lower frequency side than the lowest frequency carrier frequency F_L does not exist in the band of the modulation signal based on the lower frequency carrier frequency than the lowest frequency carrier frequency F_L. The fourth condition is satisfied. Incidentally, the combination of “adjacent three carrier frequencies” is “F_2, F_3, F_4” or “F_3, F_4, F_5” or “F_4, F_5, F_6” in the case of the first example. The case is “F_1, F_2, F_3” or “F_2, F_3, F_4” or “F_3, F_4, F_5”.

  In both the first example and the second example, the third intermodulation wave generated based on the highest carrier frequency F_H and the intermediate carrier frequency F_M among the three carrier frequencies. The third-order intermodulation wave generated on the higher frequency side than the highest frequency carrier frequency F_H is not present in the band of the modulation signal based on the higher frequency carrier frequency than the highest frequency carrier frequency F_H. The fifth condition is also satisfied. Incidentally, the combination of “three adjacent carrier frequencies” is “F_1, F_2, F_3” or “F_2, F_3, F_4” or “F_3, F_4, F_5” in the case of the first example. The case is "F_0, F_1, F_2" or "F_1, F_2, F_3" or "F_2, F_3, F_4".

<7-band frequency arrangement>
FIGS. 10 and 11 are diagrams for explaining a method for determining the frequency arrangement when using seven carrier frequencies having different frequencies (referred to as 7 bands). Here, FIG. 10 shows a first example of a seven-band frequency arrangement, and FIG. 11 shows a second example of a seven-band frequency arrangement.

  N-order (third-order) intermodulation distortion components generated based on two adjacent carrier frequencies in which the bands of the modulation signals based on the respective carrier frequencies do not overlap among the seven carrier frequencies. As a condition for the frequency of the non-existent frequency to be present in none of the modulation signal bands based on the carrier frequencies, a frequency arrangement determined at the time of 6 bands is newly added to the lower side or the higher side. The three-band frequency arrangement determination method may be similarly applied to three adjacent carrier frequencies including the sixth carrier frequency.

  This will be specifically described below. For convenience of description of the magnitude relationship between frequencies, a modification example based on the first example of the 6-band frequency arrangement will be described.

[First example]
The first example is a mode in which a seventh carrier frequency is newly added on the higher frequency side based on the first example of the frequency arrangement of 6 bands. The seventh carrier frequency is F_7, and the frequency is high or low. F_1 <F_2 <F_3 <F_4 <F_5 <F_6 <F_7. Then, the three-band frequency arrangement determination method is similarly applied to the three carrier frequencies F_5, F_6, and F_7.

  Of the three carrier frequencies F_5, F_6, and F_7, the lowest carrier frequency F_L is the carrier frequency F_5, the intermediate carrier frequency F_M is the carrier frequency F_6, and the highest carrier frequency F_H is the carrier frequency. F_7.

  A frequency difference (= F_7−F_6) between the carrier frequency F_6 and the carrier frequency F_7 is set to D67. The first frequency difference Δ1 obtained as the difference between the lowest carrier frequency F_L (= F_5) of the three carrier frequencies F_5, F_6, and F_7 and the intermediate carrier frequency F_M (= F_6) is D56. Yes, the second frequency difference Δ2 obtained as the difference between the highest carrier frequency F_H (= F_7) of the three carrier frequencies F_5, F_6, and F_7 and the intermediate frequency carrier frequency F_M (= F_6) is D67.

  The total reception bandwidth of the modulated signal based on the carrier frequency F_7 is Bw7. Of the total reception bandwidth Bw7, the low bandwidth reception bandwidth is Bw7_L, and the high bandwidth reception bandwidth is Bw7_H. The band interval between the modulation signal based on the carrier frequency F_6 and the modulation signal based on the carrier frequency F_7 is set to H67. Mathematically, the band interval H67 is “D67−Bw6_H−Bw7_L”.

  Of the third-order intermodulation distortion components generated based on the carrier frequency F_6 and the carrier frequency F_7, the distortion frequency (= 2F_6-F_7) of the low frequency component (low frequency component) is IM67, and the high frequency component ( The distortion frequency (= 2F_7−F_6) of the component on the high frequency side is IM76.

  In these cases, regarding the frequency arrangement of the three carrier frequencies F_5, F_6, and F_7, the determination method of the first example of the frequency arrangement of three bands may be similarly applied as D56 <D67.

  Although a detailed description is omitted, a first frequency difference Δ1 (= D56) obtained as a difference between the carrier frequency F_L (= F_4) and the carrier frequency F_M (= F_5) is expressed as a modification of the equation (4). It is specified in the range indicated by (25).

  “Bw5_H + Bw6_L <D56” in the expression (25) corresponds to the condition 1 described above. In Expression (25), “D56 <D67− (the larger one of Bw5_L and Bw7_L)” can be transformed to “| D56-D67 |> (the larger one of Bw5_L and Bw7_L)”, which is the condition 2 described above. And corresponding.

  Accordingly, the frequency arrangement of the three carrier frequencies F_1, F_2, and F_3 is determined so as to satisfy the equation (4), and the frequency arrangement of the three carrier frequencies F_2, F_3, and F_4 is determined so as to satisfy the equation (11). It is determined that the frequency arrangement of the carrier frequencies F_3, F_4, and F_5 satisfies Expression (15), and the frequency arrangement of the three carrier frequencies F_4, F_5, and F_6 is determined so as to satisfy Expression (21), and the three carrier frequencies F_5, The frequency arrangement of F_6 and F_7 is determined so as to satisfy Expression (25). Alternatively, the frequency arrangement of the three carrier frequencies F_1, F_2, and F_3 is determined so as to satisfy Equation (4), and the frequency arrangement of the four carrier frequencies F_2, F_3, F_4, and F_5 is determined so as to satisfy Equation (16). It is determined that the frequency arrangement of the three carrier frequencies F_4, F_5, and F_6 satisfies Equation (21), and the frequency arrangement of the three carrier frequencies F_5, F_6, and F_7 satisfies Equation (25). As a result, like the three-band frequency arrangement, linear performance of a receiver amplifier, a frequency mixing unit (mixer), etc. can be relaxed without using a high-selectivity band-limiting filter, thereby reducing cost and power consumption. Reduction, circuit scale reduction, and the like can be performed.

  Since Expression (25) defines the range of the frequency difference D45 as in Expression (21), the frequency difference D45 must eventually satisfy both Expression (21) and Expression (25). I must. Therefore, the frequency difference D45 is defined in a range represented by the equation (26) by combining the equations (21) and (25).

  Further, when Bw7_L = B7_H, since Bw7_L = Bw7_H = Bw7 / 2, Expression (25) can be transformed into Expression (27-1). Further, assuming that all the bands of the modulated signals are equally Bw (= Bw1 = Bw2 = Bw3 = Bw4 = Bw5 = Bw6 = Bw7), Expression (27-1) is simplified as Expression (27-2). Further, when D12 = D34 = D56 and D23 = D45 = D67, Expression (27-2) can be transformed into Expression (27-3).

[Second example]
The second example is a mode in which a seventh carrier frequency is newly added on the lower frequency side based on the first example of the 6-band frequency arrangement. The seventh carrier frequency is F_0, and the frequency is high or low. F_0 <F_1 <F_2 <F_3 <F_4 <F_5 <F_6. The three-band frequency arrangement determination method is similarly applied to the three carrier frequencies F_0, F_1, and F_2.

  Of the three carrier frequencies F_0, F_1, and F_2, the lowest carrier frequency F_L is the carrier frequency F_0, the intermediate carrier frequency F_M is the carrier frequency F_1, and the highest carrier frequency F_H is the carrier frequency. F_2.

  The frequency and frequency difference are the same as those described in the determination method of the second example of the 4-band frequency arrangement. However, regarding the frequency arrangement of the three carrier frequencies F_0, F_1, and F_2, D01> D12, The determination method of the second example of the frequency arrangement is similarly applied.

  Although a detailed description is omitted, the second frequency difference Δ2 (= D12) obtained as the difference between the carrier frequency F_H (= F_2) and the carrier frequency F_M (= F_1) is expressed as a modification of the equation (9). It is specified in the range indicated by (28).

  Since Expression (28) is the same as Expression (23) and defines the range of the frequency difference D12 as in Expression (4), Expression (18), and Expression (23), Expression (4) and The expression (28) is collectively defined in the range indicated by the expression (19).

  The three carrier frequencies F_1, F_2, and F_3 are determined to satisfy the equation (4), and the three carrier frequencies F_2, F_3, and F_4 are determined to satisfy the equation (11). The frequency arrangement of F_3, F_4, and F_5 is determined to satisfy Expression (15), and the frequency arrangement of the three carrier frequencies F_4, F_5, and F_6 is determined to satisfy Expression (21), and the three carrier frequencies F_0, F_1, The frequency arrangement of F_2 is determined so as to satisfy Expression (28). Alternatively, the frequency arrangement of the three carrier frequencies F_1, F_2, and F_3 is determined so as to satisfy Equation (4), and the frequency arrangement of the four carrier frequencies F_2, F_3, F_4, and F_5 is determined so as to satisfy Equation (16). It is determined that the frequency arrangement of the three carrier frequencies F_4, F_5, and F_6 satisfies Expression (21), and the frequency arrangement of the three carrier frequencies F_0, F_1, and F_2 is determined so as to satisfy Expression (28). As a result, like the three-band frequency arrangement, linear performance of a receiver amplifier, a frequency mixing unit (mixer), etc. can be relaxed without using a high-selectivity band-limiting filter, thereby reducing cost and power consumption. Reduction, circuit scale reduction, and the like can be performed.

  When Bw0_L = B0_H, since Bw0_L = Bw0_H = Bw0 / 2, equation (28) can be transformed into equation (29-1). Further, assuming that all the bands of the modulated signals are equally Bw (= Bw0 = Bw1 = Bw2 = Bw3 = Bw4 = Bw5 = Bw6), Expression (29-1) is simplified as Expression (29-2). Furthermore, when D12 = D34 = D56 and D01 = D23 = D45, the equation (20-2) can be transformed into the equation (20-3).

  In both the first example and the second example, of the third-order intermodulation waves generated based on the lowest carrier frequency F_L and the intermediate carrier frequency F_M among the three adjacent carrier frequencies. The third-order intermodulation wave generated on the lower frequency side than the lowest frequency carrier frequency F_L does not exist in the band of the modulation signal based on the lower frequency carrier frequency than the lowest frequency carrier frequency F_L. The fourth condition is satisfied. Incidentally, the combination of “adjacent three carrier frequencies” is “F_2, F_3, F_4” or “F_3, F_4, F_5” or “F_4, F_5, F_6” or “F_5, F_6, F_7” in the first example. In the case of the second example, “F_1, F_2, F_3” or “F_2, F_3, F_4” or “F_3, F_4, F_5” or “F_4, F_5, F_6”.

  In both the first example and the second example, the third intermodulation wave generated based on the highest carrier frequency F_H and the intermediate carrier frequency F_M among the three carrier frequencies. The third-order intermodulation wave generated on the higher frequency side than the highest frequency carrier frequency F_H is not present in the band of the modulation signal based on the higher frequency carrier frequency than the highest frequency carrier frequency F_H. The fifth condition is also satisfied. Incidentally, the combination of “adjacent three carrier frequencies” is “F_1, F_2, F_3” or “F_2, F_3, F_4” or “F_3, F_4, F_5” or “F_4, F_5, F_6” in the first example. "F_0, F_1, F_2" or "F_1, F_2, F_3" or "F_2, F_3, F_4" or "F_3, F_4, F_5" in the second example.

[Frequency arrangement of 8 bands or more]
A detailed description of the frequency arrangement in the case of eight or more bands is omitted, but as can be understood from the above description, a first example of a three-band frequency arrangement based on the frequency arrangement of one less band. Alternatively, one band may be added by applying the second example. That is, a new carrier frequency is added to the lower band side or the higher band side based on the frequency arrangement of one less band, and three bands are included with respect to three adjacent carrier frequencies including the added carrier frequency. The frequency arrangement may be determined by applying the first example or the second example of the frequency arrangement.

<Specific application examples>
Hereinafter, specific application examples will be shown. For ease of explanation and understanding, unless otherwise specified, one communication apparatus will be described as including either one of a modulation unit and a demodulation unit. A signal transmission device is configured by the communication device on the transmission side and the communication device on the reception side. In the following description, a signal transmission device and an electronic device can be configured in a state in which each unit constituting the device is accommodated in one housing. The signal transmission device or the electronic device may be a single unit, or the signal transmission device or the electronic device may be entirely constituted by a combination of a plurality of signal transmission devices or a plurality of electronic devices.

  In addition, although this invention is demonstrated using an Example, the technical scope of this invention is not limited to the range as described in the below-mentioned Example. Various modifications or improvements can be made to the embodiments described below without departing from the gist of the invention, and embodiments to which such modifications or improvements are added are also included in the technical scope of the present invention. Further, the embodiments described below do not limit the invention according to the claims (claims), and all the combinations of features described in the embodiments are not necessarily essential to the solution means of the invention. . Examples described later include inventions at various stages, and various inventions can be extracted by appropriately combining a plurality of disclosed constituent elements. Each embodiment described below is not limited to being applied alone, but can be applied in any combination within a possible range. Even if some constituent elements are deleted from all the constituent elements shown in the embodiment, as long as an effect is obtained, a configuration from which these several constituent elements are deleted can be extracted as an invention.

  FIG. 12 is a diagram for explaining the first embodiment. Here, FIG. 12A shows an arrangement image of the communication device, FIG. 12B shows a detailed configuration example of the communication device, and FIG. 12C shows an example of frequency arrangement of the carrier frequencies.

  In the first embodiment, all communication devices (communication chips) are mounted on the same substrate in one electronic device, and each carrier frequency is set in advance. A case is assumed in which three or more transmission / reception combinations are randomly performed on a circuit board in an electronic device regardless of the arrangement and the directivity of radio waves.

  For example, FIG. 12 shows a case where a 3-band frequency arrangement is applied. As shown in FIG. 12A, on a circuit board 701 in the electronic device 751, a set of a communication device 710_1 having a transmitter function and a communication device 810_1 having a receiver function and a transmitter function are provided. A signal transmission device comprising a combination of three sets of transmission / reception such as a communication device 710_2 and a communication device 810_2 having a receiver function, a communication device 710_3 having a transmitter function and a communication device 810_3 having a receiver function. 1A is accommodated.

  As shown in FIG. 12B, each of the communication device 710_1, the communication device 710_2, and the communication device 710_3 includes a modulation target signal processing unit 712, a signal amplification unit 713, and a carrier frequency F_ @ (@ is a local frequency) 1, 2 or 3), a transmission side local oscillation unit 714, a frequency mixing unit 715 (so-called mixer), and an output amplification unit 717, and a transmission antenna 718 is connected to the output amplification unit 717. ing. The transmission-side local oscillation unit 714 and the frequency mixing unit 715 constitute a modulation unit. The modulation target signal processing unit 712 includes, for example, a low-pass filter, and limits the reception bandwidth of the modulated signal. The signal amplification unit 713 multiplies the amplitude of the signal output from the modulation target signal processing unit 712 by a gain. The frequency mixing unit 715 performs modulation processing by multiplying the signal output from the signal amplification unit 713 by the carrier signal (carrier frequency F_ @) from the transmission-side local oscillation unit 714. The output amplifier 717 multiplies the amplitude of the signal modulated by the frequency mixer 715 by a gain.

  As illustrated in FIG. 12B, each of the communication device 810_1, the communication device 810_2, and the communication device 810_3 includes an input amplification unit 812, a reception-side local oscillation unit 814 that generates the carrier frequency F_ @, and a frequency mixing unit 815. (A so-called mixer), a demodulated signal processing unit 816 (for example, a low-pass filter), and an output amplification unit 817, and a reception antenna 818 is connected to the input amplification unit 812. The reception side local oscillation unit 814 and the frequency mixing unit 815 constitute a demodulation unit. Input amplifier 812 multiplies the amplitude of the received signal received by receiving antenna 818 by a gain. The frequency mixing unit 815 performs a demodulation process by multiplying the reception signal output from the input amplification unit 812 by the carrier signal (carrier frequency F_ @) from the reception-side local oscillation unit 814. The demodulated signal processing unit 816 has, for example, a low-pass filter, and limits the reception bandwidth of the demodulated signal. The output amplifier 817 multiplies the amplitude of the demodulated signal output from the demodulated signal processor 816 by a gain.

  As shown in FIG. 12 (B-1), a modulated signal S711 having a total reception bandwidth Bw1 is input to a communication device 710_1, modulated by a transmission-side local oscillation unit 714 having a carrier frequency F_1, and transmitted to a transmission antenna 718. Send radio waves. The receiving antenna 818 receives this modulated signal, inputs it to the communication device 810_1, demodulates it by the demodulator, and outputs a demodulated signal S811 from the output amplifier 817.

  As shown in FIG. 12 (B-2), the modulated signal S721 having the entire reception bandwidth Bw2 is input to the communication device 710_2, modulated by the transmission-side local oscillation unit 714 having the carrier frequency F_2, and transmitted to the transmission antenna 718. Send radio waves. The receiving antenna 818 receives this modulated signal, inputs it to the communication device 810_2, demodulates it by the demodulator, and outputs a demodulated signal S821 from the output amplifier 817.

  As shown in FIG. 12 (B-3), the modulated signal S731 having the entire reception bandwidth Bw3 is input to the communication device 710_3, modulated by the transmission-side local oscillation unit 714 having the carrier frequency F_3, and transmitted to the transmission antenna 718. Send radio waves. The receiving antenna 818 receives this modulated signal, inputs it to the communication device 810_3, demodulates it by the demodulator, and outputs a demodulated signal S831 from the output amplifier 817.

  Here, as the frequency arrangement of the three carrier frequencies F_1, F_2, and F_3, the first example or the second example of the above-described three-band frequency arrangement is applied. For example, the example shown in FIG. 12C shows a case where the first example of a three-band frequency arrangement is applied. By pre-setting the frequency arrangement of the three carrier frequencies F_1, F_2, and F_3 as shown in FIG. 12C, the receiver amplifier and frequency mixing unit (mixer) can be used without using a band-select filter with high selectivity. ) And the like, and cost reduction, power consumption reduction, circuit scale reduction, and the like can be performed.

  For example, unlike field communication such as so-called cellular, in wireless transmission within or between devices, propagation path conditions do not change, reception power fluctuations and timing fluctuations are virtually absent (none or very little), and propagation There are features such as a short distance and a small multipath delay spread. These are collectively referred to as “wireless transmission within or between devices”. In “wireless transmission within a device or between devices”, it is not always necessary to check the state of a propagation path as in the case of outdoor wireless communication, and it may be considered that a predetermined setting value can be used. In other words, “wireless transmission within or between devices” may be considered as wireless signal transmission in a static environment, and communication environment characteristics may be considered to be substantially unchanged. This means that “the parameter setting may be unchanged (fixed) because the communication environment is unchanged (fixed)”.

  The transmission characteristics between the transmission unit and the reception unit can be handled as known. For example, even when the arrangement position of the transmission unit and the reception unit in one housing does not change (in the case of in-device communication), or when each of the transmission unit and the reception unit is arranged in each separate housing, The transmission conditions between transmission and reception do not substantially change as in the case where the arrangement positions of the transmission unit and the reception unit are in a predetermined state (in the case of wireless transmission between devices at relatively short distances) (that is, Under a fixed environment, transmission characteristics between the transmission unit and the reception unit can be known in advance.

  For example, as in this embodiment, when performing simultaneous communication using different carrier frequencies in a combination of a plurality of modulation circuits and demodulation circuits, within a device as the same area or between devices at a relatively short distance, It may be considered that a communication channel using an unexpected carrier frequency cannot suddenly appear. Therefore, for example, each carrier frequency to be used for multi-channel transmission by frequency division multiplexing is determined in advance at the time of product shipment, and the information is stored in a memory. The carrier frequency used for demodulation may be set. Unlike the second embodiment, which will be described later, the transmission / reception combination is fixed, but a dynamic control mechanism that constantly monitors the communication environment characteristics and optimizes the arrangement of the carrier frequencies based on the result is unnecessary. Therefore, the circuit scale can be reduced and the power consumption can be reduced.

  FIG. 13 is a diagram for explaining the second embodiment. Here, FIG. 13A shows an arrangement image of the communication device and the frequency control unit, and FIG. 13B shows a detailed configuration example of the communication device and a connection relationship between the communication device and the frequency control unit.

  In the second embodiment, the carrier frequency can be dynamically controlled as compared with the first embodiment. The difference from Example 3 described later is that control information is transmitted only to the transmitting side. Hereinafter, differences from the first embodiment will be described.

  On the circuit board 701 in the electronic device 751, in addition to a set of the three communication devices 710 and 810, a frequency control unit 702 for controlling the three carrier frequencies F_1, F_2, and F_3 on the transmission side is provided. A signal transmission device 1B is accommodated. For example, if the frequency control unit 702 is a device that can execute a program by software such as a CPU, appropriate frequency allocation can be dynamically performed. In wireless device signal transmission (that is, wireless signal transmission in the same area), when performing simultaneous communication using different carrier frequencies in a combination of a plurality of modulation circuits and demodulation circuits, each carrier frequency is It can be controlled to an optimal position.

  The signal transmission apparatus 1B is provided with a spare transmission / reception set as necessary. The figure shows an example in which a pair of a communication device 710_4 and a communication device 810_4 that performs modulation and demodulation at the carrier frequency F_4 is provided as a spare transmission / reception set.

  Control information S702 including frequency allocation control information for controlling each carrier frequency F_ @ (@ is one of 1, 2, 3, 4) is supplied from the frequency control unit 702 to each communication device 710. The Control information other than frequency allocation may be supplied from the frequency control unit 702 to each communication device 710.

  Transmission of the control information S702 to each communication device 710 may be wired or wireless, but here, simultaneous communication using different carrier frequencies in a set of a plurality of modulation circuits and demodulation circuits in the same substrate. Paying attention to the point to perform, it will be wired transmission using printed wiring. The device configuration can be made more compact than wireless transmission.

  When the control information S702 is transmitted wirelessly, the used communication band is a frequency band of a carrier frequency (for example, millimeter wave) used for normal modulated signal wireless communication between the communication device 710 and the communication device 810. Band and centimeter wave band to submillimeter wave band including both upper and lower sides) should not be used. For example, it may be performed by infrared communication or laser light communication. This is to ensure that the wireless transmission of the control information S702 does not impair the normal wireless transmission for the modulated signal.

  According to the second embodiment, it is possible to optimally control in-device transmission by performing appropriate frequency allocation by the frequency control unit 702 that controls the carrier frequency on the transmission side. Although the frequency allocation can be set at the initial setting, there is an advantage that the carrier frequency on the transmission side can be dynamically set when the apparatus is used.

  For example, the operation of three bands (three carrier frequencies F_1, F_2, and F_3) is already performed in the communication device 710_1 and the communication device 810_1, the communication device 710_2 and the communication device 810_2, and the communication device 710_3 and the communication device 810_3. In this state, one band (carrier frequency F_4) in the set of the communication device 710_4 and the communication device 810_4 can be newly added. In addition, by switching the carrier frequency used by each of the communication device 710_1, the communication device 710_2, and the communication device 710_3 among the three carrier frequencies F_1, F_2, and F_3, transmission and reception can be performed without changing the reception carrier frequency. You can also switch pairs.

  Although not shown, each communication device 810 notifies the frequency control unit 702 of information on whether or not interference due to intermodulation distortion has occurred, and based on the information, the carrier frequency used on the disturbing station side. You may control to switch. Communication failure due to intermodulation distortion can be prevented without changing the carrier frequency used on the disturbed station side that has suffered communication failure. This is effective as a countermeasure when the frequency allocation setting is not appropriate or when a communication failure occurs due to intermodulation distortion components after the fourth order. For example, when a communication failure due to intermodulation distortion occurs in outdoor wireless communication, it is possible to switch the carrier frequency used on the disturbed station side, but the disturbed station switches the carrier frequency used on the disturbing station side. It is very different from the control that cannot be done.

  FIG. 14 is a diagram for explaining the third embodiment. Here, FIG. 14A shows an arrangement image of the communication device and the frequency control unit, and FIG. 14B shows a detailed configuration example of the communication device and a connection relationship between the communication device and the frequency control unit.

  The third embodiment is similar to the second embodiment in that the carrier frequency can be dynamically controlled with respect to the first embodiment. The difference from the second embodiment is that control information is also transmitted to the receiving side. Hereinafter, differences from the first embodiment and the second embodiment will be described.

  On the circuit board 701 in the electronic device, in addition to a set of three communication devices 710 and 810, a frequency control unit 704 that controls each of the three carrier frequencies F_1, F_2, and F_3 on the transmission side and the reception side is provided. The provided signal transmission device 1C is accommodated. A spare transmission / reception set is provided as necessary. The figure shows an example in which a pair of a communication device 710_4 and a communication device 810_4 that performs modulation and demodulation at the carrier frequency F_4 is provided as a spare transmission / reception set.

  Control information S704 including control information for frequency allocation for controlling each carrier frequency F_ @ (@ is any one of 1, 2, 3, 4) is supplied from the frequency control unit 704 to each communication device 710. The Further, control information S804 including frequency allocation control information for controlling each carrier frequency F_ @ (@ is any one of 1, 2, 3, 4) is transmitted from the frequency control unit 704 to each communication device 810. Supplied. Control information other than frequency allocation may be supplied from the frequency control unit 704 to each communication device 710 or each communication device 810. Transmission of the control information S702 to each communication device 710 and transmission of the control information S804 to each communication device 810 may be wired or wireless (for example, infrared), but here, wired transmission using printed wiring is performed.

  According to the third embodiment, the frequency control unit 704 that controls the carrier frequencies on the transmission side and the reception side can perform optimal frequency assignment, thereby optimally controlling the intra-device transmission. Frequency allocation can be set at the initial setting, but not only has the advantage that the carrier frequency on the transmitter side can be set dynamically when the device is used, but also the carrier frequency on the receiver side can be set dynamically, and the receiver operation There is also an advantage that can be controlled. For example, the transmission / reception group can be switched by switching the carrier frequency used by each of the communication device 810_1, the communication device 810_2, and the communication device 810_3 among the three carrier frequencies F_1, F_2, and F_3. Since the carrier frequencies on both the transmission side and the reception side can be switched, the degree of freedom of switching is higher than that of a configuration in which only one of the transmission side and the reception side is switched.

[Modification of Example 2 and Example 3]
Although not shown in the drawings, as a modification of the second and third embodiments, the control information may be transmitted only to the receiving side to dynamically control the receiving carrier frequency. In this case, the transmission / reception set can be switched by switching the reception carrier frequency without switching the transmission carrier frequency.

  FIG. 15 is a diagram for explaining the fourth embodiment. Here, FIG. 15A shows an arrangement image of the communication device, and FIG. 15B shows a detailed configuration example of the communication device. FIG. 16 is a diagram illustrating a modification of the fourth embodiment. Here, FIG. 16A shows an arrangement image of the communication device, and FIG. 16B shows a detailed configuration example of the communication device.

  The fourth embodiment and its modification are forms in which the communication device has a function of a frequency control unit that controls the carrier frequency, as compared with the second and third embodiments. That is, the difference from the second and third embodiments is that a control signal including frequency allocation information is transmitted wirelessly. FIG. 15 is a modified example of the second embodiment, in which only the carrier frequency on the transmission side is switched. However, as in the third embodiment, the carrier frequency on both the transmission side and the reception side is switched, or the reception side Alternatively, only the carrier frequency may be switched. Hereinafter, differences from the second embodiment will be described.

  As shown in FIGS. 15A and 16A, a signal transmission device 1D provided with four circuit boards 701_1, circuit boards 701_2, circuit boards 701_3, and 701_4 in one electronic device 751 is provided. Contained. The circuit board 701_1 is provided with a communication device 721 having functions of a transmitter (similar to the communication device 710_1) and the frequency control unit 702 (or the frequency control unit 704). The circuit board 701_2 accommodates a signal transmission device 1D provided with a communication device 722 and a communication device 724 having functions of a transmitter and a receiver, and a communication device 810_3 having a function of a receiver. The circuit board 701_3 is provided with a communication device 723 having functions of a transmitter and a receiver and a communication device 810_3 having a function of a receiver. The circuit board 701_4 is provided with a communication device 810_4 having a receiver function. By using the bands of the carrier frequency F_2 and the carrier frequency F_3 for mutual transmission and reception between the circuit board 701_2 and the circuit board 701_3, bidirectional signal transmission can be controlled between the circuit boards.

  As shown in FIGS. 15B and 16B, the communication device 722 includes a communication device 810_12 having a receiver function and a communication device 710_2 having a transmitter function, and the communication device 810_12 is demodulated. The carrier frequency F_2 of the communication device 710_2 is controlled by the control signal S706. The communication device 723 includes a communication device 810_13 having a receiver function and a communication device 710_3 having a transmitter function, and the communication device 810_13 controls the carrier frequency F_3 of the communication device 710_3 by the demodulated control signal S707. It has become. The communication device 724 includes a communication device 810_14 having a receiver function and a communication device 710_4 having a transmitter function, and the communication device 810_14 controls the carrier frequency F_4 of the communication device 710_4 by the demodulated control signal S708. It has become. As a pair of transmission / reception for transmission of control information S705, a pair of communication device 710_1 of communication device 721 and communication device 810_12 of communication device 722, a pair of communication device 710_1 of communication device 721 and communication device 810_13 of communication device 723, There are three pairs of a communication device 710_1 of the communication device 721 and a communication device 810_14 of the communication device 724, and the communication device 710_1 is also used as a pair of three transmission / reception.

  When the control information S705 is transmitted wirelessly to the communication device 810_12, the communication device 810_13, and the communication device 810_14, the communication frequency used is a carrier frequency used for wireless communication between the communication device 710 and the communication device 810. Frequency band (for example, a millimeter wave band or a centimeter wave band to a submillimeter wave band including both upper and lower sides thereof). For example, wireless communication is performed at the carrier frequency F_1 between the communication device 721, the communication device 810_12, the communication device 810_13, and the communication device 810_14. The control signal S705 including the frequency allocation information is modulated by the communication device 721 by the transmission-side local oscillation unit 714 having the carrier frequency F_1, and is emitted from the transmission antenna 718 by radio waves. For example, if the communication device 721 that functions as the frequency control unit 702 or the frequency control unit 704 is a device that can execute a program by software such as a CPU, appropriate frequency allocation can be dynamically performed. In wireless signal transmission within a device or between devices (that is, wireless signal transmission within the same area), a carrier is used when simultaneous communication is performed using a different carrier frequency in a combination of a modulation circuit and a demodulation circuit. The frequency can be controlled to an optimum position.

  In the communication device 722 including the communication device 810_12 having the carrier frequency F_1 and the communication device 710_2 having the carrier frequency F_2, the modulation signal based on the carrier frequency F_1 is received by the reception antenna 818 and received by the communication device 810_12 to demodulate the control signal S706. By supplying the control signal S706 to the communication device 710_2, the carrier frequency F_2 and the like of the communication device 710_2 are controlled. The modulated signal S721 is modulated by the communication device 710_2 having the carrier frequency F_2 and emitted from the transmitting antenna 718 by radio waves. This radio wave is received by the receiving antenna 818 and received by the communication device 810_2, and the demodulated signal S821 is demodulated by the demodulator.

  In the communication device 723 including the communication device 810_13 having the carrier frequency F_1 and the communication device 710_3 having the carrier frequency F_3, the modulation signal based on the carrier frequency F_1 is received by the reception antenna 818 and received by the communication device 810_13, and the control signal S707 is demodulated. By supplying the control signal S707 to the communication device 710_3, the carrier frequency F_3 and the like of the communication device 710_3 are controlled. The modulated signal S731 is modulated by the communication device 710_3 having the carrier frequency F_3 and emitted from the transmission antenna 718 by radio waves. This radio wave is received by the receiving antenna 818 and received by the communication device 810_3, and the demodulated signal S831 is demodulated by the demodulator.

  The communication device 724 including the communication device 810_14 having the carrier frequency F_1 and the communication device 710_4 having the carrier frequency F_4 receives the modulation signal based on the carrier frequency F_1 by the reception antenna 818 and receives it by the communication device 810_14 and demodulates the control signal S708. By supplying the control signal S708 to the communication device 710_4, the carrier frequency F_4 and the like of the communication device 710_4 are controlled. The modulated signal S741 is modulated by the communication device 710_4 having the carrier frequency F_4, and is emitted from the transmitting antenna 718 by radio waves. The radio wave is received by the receiving antenna 818 and received by the communication device 810_4, and the demodulated signal S841 is demodulated by the demodulator.

  As described above, in the fourth embodiment, by transmitting a frequency control signal for controlling the carrier frequency wirelessly, the same operation as in the second embodiment can be performed. However, the frequency assignment can be controlled. For example, the frequency allocation can be set at the initial setting, but when one band is newly added in a state where the operation of the wireless communication has already been performed, the frequency arrangement of the carrier frequency F_1 is made appropriate, The frequency allocation of the remaining carrier frequencies F_2 to F_4 can be dynamically controlled wirelessly.

  For example, in the aspect shown in FIG. 15, the carrier frequency F_1 is used only for wireless transmission of the control signal S705, and signal transmission between the communication device 710_2 and the communication device 810_2 using the carrier frequency F_2 is performed. Signal transmission between the communication device 710_4 and the communication device 810_4 newly using the carrier frequency F_4 in a state where signal transmission is performed between the communication device 710_3 and the communication device 810_3 using the carrier frequency F_3. To start.

  On the other hand, in the modification shown in FIG. 16, in addition to the mode shown in FIG. 15, the carrier frequency F_1 is used not only to transmit the control signal S705 but also the modulated signal S711 of the entire reception bandwidth Bw1. ing. That is, the communication device 721 is used both for transmitting a normal modulated signal and for transmitting a control signal. In FIG. 16B, all of the communication device 722, the communication device 723, and the communication device 724 are described so as to output a demodulated signal S811 corresponding to the modulated signal S711. However, this is not essential. Only one of them needs to be supported. In the case of this modification, signal transmission between the communication device 710 using the carrier frequency F_1 (similar to the communication device 710_1) and the communication device 810_1, and the communication device 710_2 and the communication device 810_2 using the carrier frequency F_2 are performed. And communication with the communication device 710_4 newly using the carrier frequency F_4 in a state where signal transmission is performed between the communication device 710_3 and the communication device 810_3 using the carrier frequency F_3. Signal transmission to and from the device 810_4 can be started.

  Although not shown, the receiver operation can be controlled by providing the receiver (communication device 810) in the band of the carrier frequency F_1 on the receiver side as in the third embodiment, as in the third embodiment. Can be controlled wirelessly.

  Similarly, when using the bands of the carrier frequency F_2 and the carrier frequency F_3 for mutual transmission and reception between the circuit board 701_2 and the circuit board 701_3, the bidirectional signal transmission between the circuit boards is also controlled. Allocation can be controlled wirelessly.

  FIG. 17 is a diagram for explaining the fifth embodiment. Here, FIG. 17A shows an arrangement image of the communication device, and FIG. 17B shows a detailed configuration example of the communication device.

  The fifth embodiment is characterized in that the same operation as that of the fourth embodiment is performed in wireless transmission between a plurality of electronic devices. FIG. 17 shows a configuration in which only the carrier frequency on the transmission side is switched. However, as in the third embodiment, a configuration in which the carrier frequency on both the transmission side and the reception side is switched, or a configuration in which only the carrier frequency on the reception side is switched. Good.

  For example, as shown in FIG. 17A, the first electronic device 752 accommodates a signal transmission device 1E_1 provided with two circuit boards 701_1 and 701_2. In the second electronic device 753, a signal transmission device 1E_2 provided with two circuit boards 701_3 and 701_4 is accommodated. The signal transmission device 1E_1 and the signal transmission device 1E_2 constitute the entire signal transmission device 1E. Others are the same as in the fourth embodiment.

  Note that the dotted line in FIG. 17B indicates that the communication device 721 is used for transmission of the normal modulated signal (modulated signal S711) and the control signal S705, as in the modification of the fourth embodiment. This is a mode in the case of being used for both transmission.

  For each transmission / reception group, a transmission-side communication device 710 (communication unit: transmission unit) and a reception-side communication device 810 (communication unit: reception unit) are housed in different electronic device cases. When the electronic device 752 and the electronic device 753 are arranged at a predetermined position and integrated with each other, a wireless signal transmission path is formed between the communication units (transmission unit and reception unit) in both the electronic devices, as in the fourth embodiment. It becomes the state of. Therefore, as in the fourth embodiment, the frequency assignment can be controlled by wirelessly transmitting a frequency control signal for controlling the carrier frequency.

[Modification of Example 1 to Example 5]
In the above description, one communication apparatus is provided with one of the modulation unit and the demodulation unit. However, the present invention is not limited to this. For example, in the case where a plurality of sets of modulation units and demodulation units are provided in one set of communication apparatuses and multicarrier transmission (for example, OFDM transmission) is performed, the concept of the first to fifth embodiments is similarly applied. Applicable. In short, regardless of where the modulation unit and the demodulation unit are provided (arranged) in the communication device or the electronic device, a plurality of combinations of the modulation unit and the demodulation unit are provided. When the carrier signals having different frequencies are used in each set, the ideas of the first to fifth embodiments described above can be similarly applied.

  The sixth embodiment is an example in which the frequency arrangement (frequency allocation) of the carrier frequencies of the above-described embodiments is applied to an electronic device. Three typical cases are shown below.

[First example]
FIG. 18 is a diagram illustrating a first example of an electronic apparatus according to the sixth embodiment. The first example is an application example in the case where signal transmission is performed wirelessly within the casing of one electronic device. As an electronic device, an example of application to an imaging device including a solid-state imaging device will be described. This type of imaging device is distributed in the market as, for example, a digital camera, a video camera (camcorder), or a computer camera (Web camera).

  The first communication device is mounted on a main board on which a control circuit, an image processing circuit, and the like are mounted, and the second communication device is mounted on an imaging board (camera board) on which a solid-state imaging device is mounted.

  An imaging board 502 and a main board 602 are disposed in the housing 590 of the imaging apparatus 500. A solid-state imaging device 505 is mounted on the imaging substrate 502. For example, the solid-state imaging device 505 is a CCD (Charge Coupled Device), and includes a case where the solid-state imaging device 505 is mounted on the imaging substrate 502 including its drive unit (horizontal driver or vertical driver), or a CMOS (Complementary Metal-oxide Semiconductor) sensor. To do.

  The semiconductor chip 103 is mounted on the main substrate 602, and the semiconductor chip 203 is mounted on the imaging substrate 502. Although not shown, peripheral circuits such as an imaging drive unit are mounted on the imaging substrate 502 in addition to the solid-state imaging device 505, and an image processing engine 605, an operation unit, various sensors, and the like are mounted on the main substrate 602. .

  Each of the semiconductor chip 103 and the semiconductor chip 203 incorporates functions equivalent to those of the transmission chip and the reception chip. By incorporating both functions of the transmission chip and the reception chip, it is possible to cope with bidirectional communication.

  The solid-state imaging device 505 and the imaging drive unit correspond to the application function unit of the LSI function unit on the first communication device side. The LSI function unit is connected to a signal generator on the transmission side, and is further connected to an antenna 236 (transmission location) via a transmission line coupling unit. The signal generation unit and the transmission path coupling unit are accommodated in a semiconductor chip 203 different from the solid-state imaging device 505 and are mounted on the imaging substrate 502.

  The image processing engine 605, the operation unit, various sensors, and the like correspond to the application function unit of the LSI function unit on the second communication device side, and the image processing unit that processes the imaging signal obtained by the solid-state imaging device 505 is accommodated. . The LSI function unit is connected to a signal generation unit on the reception side, and is further connected to an antenna 136 (reception location) via a transmission line coupling unit. The signal generation unit and the transmission path coupling unit are accommodated in a semiconductor chip 103 different from the image processing engine 605 and are mounted on the main substrate 602.

  The signal generation unit on the transmission side includes, for example, a multiplexing processing unit, a parallel serial conversion unit, a modulation unit, a frequency conversion unit, an amplification unit, and the like, and the signal generation unit on the reception side includes, for example, an amplification unit, a frequency conversion unit, and a demodulation unit Unit, serial / parallel conversion unit, unification processing unit, and the like. These points are the same in other application examples described later.

  By performing wireless communication between the antenna 136 and the antenna 236, an image signal acquired by the solid-state imaging device 505 is transmitted to the main board 602 via the wireless signal transmission path 9 between the antennas. In this case, for example, a reference clock for controlling the solid-state imaging device 505 and various control signals are transmitted via the wireless signal transmission path 9 between the antennas to the imaging board 502. Is transmitted to.

  18A-1 and 18B-1 are each provided with two systems of wireless signal transmission lines 9, and in FIG. 18A, a free space transmission line 9B is provided. In (B), the hollow waveguide 9L is used. There are three pairs of transmission / reception pairs in each system, for example, a frequency division multiplexing system is adopted.

  The hollow waveguide 9L may have a structure in which the periphery is surrounded by a shielding material and the inside is hollow. For example, the periphery is surrounded by a conductor MZ, which is an example of a shielding material, and the interior is hollow. For example, an enclosure of the conductor MZ is attached on the main board 602 so as to surround the antenna 136. The moving center of the antenna 236 on the imaging substrate 502 side is arranged at a position facing the antenna 136. Since the inside of the conductor MZ is hollow, it is not necessary to use a dielectric material, and the radio signal transmission path 9 can be easily configured at low cost.

  The basic operation of each system is the same as the operation of one system. For example, in the case of FIG. 18A of the free space transmission line 9B, the distance between systems (distance between channels: two transmissions in this example) The shorter the distance between the antennas on the antenna side is, the closer the radio signal transmission paths 9 are, and if the same carrier frequency is used in each system for simultaneous communication, interference and interference on the receiver side will occur. May become a problem. It is difficult to adjust the arrangement of the transmitting antenna (aerial), the strength of the electromagnetic wave output from the transmitting antenna, the arrangement of the receiving antenna, etc., and the distance between channels is short, avoiding interference and interference in the electromagnetic wave transmission path. When it is difficult, a frequency division multiplexing system that uses different frequency bands is also adopted for the free space transmission line 9B_1 and the free space transmission line 9B_2.

  Specifically, as shown in FIG. 18A-2, the carrier frequency F_11 is used between the antenna 136_11 and the antenna 236_11, and the carrier frequency F_12 is used between the antenna 136_12 and the antenna 236_12. A carrier frequency F_13 is used between 136_13 and the antenna 236_13. The carrier frequency F_21 is used between the antenna 136_21 and the antenna 236_21, the carrier frequency F_22 is used between the antenna 136_22 and the antenna 236_22, and the carrier frequency F_23 is used between the antenna 136_23 and the antenna 236_23.

  Six carrier frequencies are used. At this time, as shown in FIG. 18A-3, the above-described method for determining the frequency arrangement of the six bands is adopted. As a result, the linear performance of receiver amplifiers and frequency mixing units (mixers) can be relaxed without using high-selectivity band-limiting filters, reducing costs, reducing power consumption, reducing circuit scale, etc. Can be done.

  Further, as shown in FIG. 18B-1, an electromagnetic wave shield (conductor MZ: metal or the like) may be provided between two millimeter wave signal transmission lines. In this case, the frequency division multiplexing method is adopted in the three sets in the hollow waveguide 9L_1 and the frequency division multiplexing method is adopted in the three sets in the hollow waveguide 9L_2, but the relationship between the hollow waveguide 9L_1 and the hollow waveguide 9L_2 Then the same carrier frequency can be used.

  Specifically, as shown in FIG. 18B-2, the carrier frequency F_1 is used between the antenna 136_11 and the antenna 236_11, and the carrier frequency F_2 is used between the antenna 136_12 and the antenna 236_12. A carrier frequency F_3 is used between 136_13 and the antenna 236_13. The carrier frequency F_1 is used between the antenna 136_21 and the antenna 236_21, the carrier frequency F_2 is used between the antenna 136_22 and the antenna 236_22, and the carrier frequency F_3 is used between the antenna 136_23 and the antenna 236_23.

  Three carrier frequencies are used. At this time, as shown in FIG. 18B-3, the above-described method for determining the frequency arrangement of the three bands is adopted. As a result, the linear performance of receiver amplifiers and frequency mixing units (mixers) can be relaxed without using high-selectivity band-limiting filters, reducing costs, reducing power consumption, reducing circuit scale, etc. Can be done.

[Second example]
FIG. 19 is a diagram illustrating a second example of the electronic apparatus according to the sixth embodiment. The second example is an application example in the case where signal transmission is performed wirelessly between electronic devices in a state where a plurality of electronic devices are integrated. In particular, the present invention is applied to signal transmission between both electronic devices when one electronic device is mounted on the other electronic device.

  For example, a so-called IC card or memory card with a built-in central processing unit (CPU) or non-volatile storage device (for example, flash memory) is installed in the electronic device on the main unit. Some are made possible (detachable). A card type information processing apparatus which is an example of one (first) electronic device is also referred to as a “card type apparatus” below. The other (second) electronic device on the main body side is also simply referred to as an electronic device below.

  An example of the structure of the memory card 201B (planar perspective and sectional perspective) is shown in FIG. An example of the structure (planar perspective and sectional perspective) of the electronic device 101B is shown in FIG. FIG. 19C shows a structural example (cross-sectional perspective view) when the memory card 201B is inserted into the slot structure 4 (especially the opening 192) of the electronic apparatus 101B.

  The slot structure 4 is configured such that the memory card 201B (the casing 290) can be inserted into and removed from the housing 190 of the electronic apparatus 101B from the opening 192. A receiving-side connector 180 is provided at a contact position with the terminal of the memory card 201B of the slot structure 4. Connector terminals (connector pins) are not required for signals replaced with wireless transmission.

  As shown in FIG. 19A, a cylindrical concave configuration 298 (depression) is provided in the housing 290 of the memory card 201B, and as shown in FIG. 19B, a cylindrical projection is formed on the casing 190 of the electronic device 101B. A shape configuration 198 (protrusion) is provided. The memory card 201B has a plurality (three in the figure) of semiconductor chips 203 on one surface of the substrate 202, and a plurality (three in the figure) of antennas 236 (three in total) on one surface of the substrate 202. An antenna 236) is formed. The housing 290 has a concave configuration 298 formed on the same surface as each antenna 236, and the concave configuration 298 is made of a dielectric resin containing a dielectric material capable of transmitting a radio signal.

  On one side of the substrate 202, a connection terminal 280 for connecting to the electronic device 101 </ b> B at a predetermined position of the housing 290 is provided at a predetermined position. The memory card 201B partially includes a conventional terminal structure for low-speed, small-capacity signals and power supply. What can be a target of millimeter wave signal transmission has terminals removed as indicated by broken lines in the figure.

  As shown in FIG. 19B, the electronic device 101B includes a plurality (three in the drawing) of semiconductor chips 103 on the surface of the substrate 102 on the opening 192 side, and a plurality (see FIG. 19) on one surface of the substrate 102. Are three antennas 236 (three antennas 236 in total). The housing 190 has an opening 192 in which the memory card 201B is inserted and removed as the slot structure 4. When the memory card 201B is inserted into the opening 192, a convex configuration 198 having a millimeter-wave confinement structure (waveguide structure) is formed on the housing 190 at a portion corresponding to the position of the concave configuration 298. It is configured to be a body transmission line 9A.

  As shown in FIG. 19C, the housing 190 of the slot structure 4 has a convex configuration 198 (dielectric transmission line 9A) and a concave configuration 298 that are concave and convex with respect to the insertion of the memory card 201B from the opening 192. It has a mechanical structure that makes contact. When the concavo-convex structure is fitted, corresponding antennas of a plurality (three in the figure) of antennas 136 and a plurality (two in the figure) of antennas 236 face each other, and a dielectric is formed as a wireless signal transmission path 9 therebetween. A body transmission line 9A is arranged. Accordingly, it is possible to perform signal transmission by radio between the corresponding antenna 136 and antenna 236 by adopting a frequency division multiplexing method. The memory card 201B sandwiches the housing 290 between the dielectric transmission path 9A and the antenna 236, but since the material of the concave configuration 298 is a dielectric material, it greatly affects wireless transmission in the millimeter wave band. It is not a thing.

  Three carrier frequencies are used. In this case, the above-described method for determining the frequency arrangement of the three bands is employed. As a result, the linear performance of receiver amplifiers and frequency mixing units (mixers) can be relaxed without using high-selectivity band-limiting filters, reducing costs, reducing power consumption, reducing circuit scale, etc. Can be done.

[Third example]
FIG. 20 is a diagram illustrating a third example of the electronic apparatus according to the sixth embodiment. The signal transmission device 1 includes a portable image reproduction device 201K as an example of a first electronic device, and an image acquisition device 101K as an example of a second (main body side) electronic device on which the image reproduction device 201K is mounted. I have. In the image acquisition apparatus 101K, a mounting table 5K on which the image reproduction apparatus 201K is mounted is provided in a part of the housing 190. Instead of the mounting table 5K, the slot structure 4 may be used as in the second example. This is the same as the second example in that signal transmission is performed wirelessly between both electronic devices when one electronic device is attached to the other electronic device. Below, it demonstrates paying attention to difference with a 2nd example.

  The image acquisition device 101K has a substantially rectangular parallelepiped (box shape) shape and is no longer a card type. The image acquisition device 101K may be any device that acquires moving image data, for example, and corresponds to, for example, a digital recording / reproducing device or a terrestrial television receiver. The image playback device 201K has, as an application function unit, a storage device that stores moving image data transmitted from the image acquisition device 101K side, and a display unit (for example, a liquid crystal display device or an organic EL display) that reads the moving image data from the storage device. A function unit for reproducing a moving image is provided in the apparatus. Structurally, it may be considered that the memory card 201B is replaced with the image reproducing device 201K, and the electronic apparatus 101B is replaced with the image acquiring device 101K.

  A plurality of (three in the figure) semiconductor chips 103 are accommodated in a housing 190 below the mounting table 5K, for example, as in the second example (FIG. 19). ) Antenna 136 is provided. A dielectric transmission path 9 </ b> A is made of a dielectric material as a radio signal transmission path 9 in a portion of the housing 190 that faces the antenna 136. A plurality (three in the figure) of semiconductor chips 203 are accommodated in the housing 290 of the image reproducing device 201K mounted on the mounting table 5K, for example, as in the second example (FIG. 19). Corresponding to 203, antennas 236 (a total of three antennas 236) are provided. The portion of the housing 290 that faces the three antennas 236 is configured such that the radio signal transmission path 9 (dielectric transmission path 9A) is made of a dielectric material. These points are the same as in the second example.

  The third example adopts a wall surface abutting method instead of the concept of a fitting structure, and a plurality of (three in the figure) antennas when the image acquisition device 101K is placed against the corner 101a of the mounting table 5K. 136 and a plurality of antennas 236 corresponding to each other (three in the figure) are opposed to each other, and the dielectric transmission path 9A is arranged as the radio signal transmission path 9 between them. Can be surely eliminated. With such a configuration, when the image reproducing device 201K is mounted (mounted) on the mounting table 5K, it is possible to perform alignment with respect to the wireless signal transmission of the image reproducing device 201K, and the frequency between the corresponding antenna 136 and antenna 236 can be increased. By employing a division multiplexing system, wireless signal transmission can be performed. Although the housing 190 and the housing 290 are sandwiched between the antenna 136 and the antenna 236, since it is a dielectric material, it does not greatly affect wireless transmission in the millimeter wave band.

  Three carrier frequencies are used. In this case, the above-described method for determining the frequency arrangement of the three bands is employed. As a result, the linear performance of receiver amplifiers and frequency mixing units (mixers) can be relaxed without using high-selectivity band-limiting filters, reducing costs, reducing power consumption, reducing circuit scale, etc. Can be done.

<Contrast with comparative example>
21 to 22 are diagrams for explaining the comparison with the comparative example. Here, FIG. 21 is a diagram showing a basic frequency arrangement in the case where simultaneous communication is performed using a different carrier frequency in a combination of a modulation circuit and a demodulation circuit (for example, when frequency division multiplexing is applied). is there. FIG. 22 is a diagram illustrating a comparative example method for preventing modulation distortion.

  When simultaneous communication is performed using different carrier frequencies in a combination of a modulation circuit and a demodulation circuit in the same area, interference due to Nth-order intermodulation distortion caused by nonlinearity of circuit members becomes a problem. In particular, the third-order intermodulation distortion component is generated in the vicinity of the used frequency, and since the level is higher than the fourth-order and subsequent components, it is difficult to avoid interference and cause a communication failure. In order to prevent this problem, it is important to select an optimum carrier frequency.

For example, the amplifier amplifies the input signal by an amplification factor and outputs the amplified signal. At this time, if there are two input signals with different frequencies, the amplitude of each input signal in the idealized model (when the input and output are in a proportional relationship and do not include nonlinear components) Is multiplied by the gain and output. In practice, however, an amplifier has an approximately proportional relationship between input and output, but is not perfect and includes a non-linear component. In such a case, when a plurality of signals having different frequencies are input to the amplifier, a signal having a frequency not included in the input is generated at the output. This is referred to as modulation distortion (IMD: InterModulation Distortio). The frequency of the modulation distortion component is not irregular and is defined by the following equation.
± m × f1 ± n × f2 where m, n = 0, 1, 2, 3,.

  A modulation distortion of a frequency expressed by a combination of | m | + | n | (m and an absolute value of n) is referred to as N (= | m | + | n |) -order modulation distortion. For example, a modulation distortion of m = ± 1 and n = ± 1 is called a secondary distortion, a modulation distortion of m = ± 1 and n = ± 2 and a modulation distortion of m = ± 2 and n = ± 1 is called a third-order distortion. Since the primary is itself, it is excluded and becomes secondary, tertiary, quadratic, and so on. Since m and n continue indefinitely, the modulation distortion exists infinitely. However, since the attenuation actually increases as the order increases, it is usually sufficient to consider the third and fourth orders.

  The modulation distortion is classified into “cross modulation distortion” and “intermodulation distortion” according to the phenomenon in which the modulation distortion appears. In the present embodiment, measures are taken with respect to “intermodulation distortion”. "Intermodulation distortion" is a signal with a strong frequency (a jamming station) that outputs an amplitude-modulated wave. It is a phenomenon that undergoes the same modulation as modulation.

  On the other hand, “intermodulation distortion” is interference caused by two waves that have nothing to do with the own station. That is, a powerful two-frequency station other than its own station appears (either when both are strong or only one is extremely powerful), and the frequency difference (intermodulation product) between the two stations is It is a phenomenon that is received as an interference wave when it covers a reception frequency or an intermediate frequency. Therefore, interference does not occur if the reception frequency of the local station deviates from the frequency difference between the two interference stations. In the present embodiment, paying attention to this point, each carrier frequency is set at an appropriate frequency position that is not affected by interference caused by modulation distortion generated due to nonlinearity of a circuit such as an amplifier or a frequency mixing unit.

  For realization of “bidirectional communication”, for example, when the wireless signal transmission path, which is a radio wave transmission channel, is one-line (single-core) single-core bidirectional transmission, time division duplex (TDD) is applied. A half-duplex method, frequency division multiplexing (FDD), and the like are applied.

  However, in the case of time division multiplexing, since transmission and reception are separated by time division, signal transmission from the first communication device to the second communication device and signal transmission from the second communication device to the first communication device are performed simultaneously. “Simultaneous bidirectional communication (single-core simultaneous bidirectional transmission)” is not realized, and single-core simultaneous bidirectional transmission is realized by frequency division multiplexing. Frequency division multiplexing is not limited to dealing with a case where two-way simultaneous communication is performed between a pair of communication apparatuses, and is used for various signal transmissions. For example, when performing one-way communication or two-way communication between a plurality of communication devices, or by providing a plurality of pairs of modulation circuits and demodulation circuits between a pair of communication devices, such as represented by OFDM transmission Frequency division multiplexing is also used when implementing multiplex transmission (multi-channeling), such as when performing multicarrier transmission as one method of reducing the symbol rate.

  As shown in FIG. 21 (A), bidirectional communication by frequency division multiplexing uses different frequencies for transmission and reception, so the transmission reception bandwidth of the wireless signal transmission path is widened. Also, in order to realize multiplex transmission (multi-channeling) by frequency division multiplexing, as shown in FIG. 21 (B), it is modulated with each different carrier frequency F_ @ (converted into different frequency bands). Then, radio waves using these different carrier frequencies are transmitted in the same direction or in the opposite direction. In this case, when a different frequency is used for each communication system (communication channel), the transmission / reception bandwidth is made wider as shown in FIG. 21 (C) and FIG. 21 (D). Here, in the example of the frequency arrangement shown in FIGS. 21B to 21C, the frequency bands F_ @ (so-called communication channels) are arranged at almost equal frequency intervals, and the third order between adjacent communication channels. The intermodulation distortion has the same frequency as the adjacent channel and causes interference.

  Both “intermodulation distortion” and “intermodulation distortion” can be prevented by preventing radio waves outside the necessary band from being input to the high-frequency amplifier. Alternatively, it can also be prevented by improving the linearity of the amplifier, frequency mixing section, etc. that are the cause of the occurrence. That is, since the cause is the non-linear operation of the circuit in the first place, it is effective to design such that the circuit operates in the linear region as much as possible.

  For example, in-device transmission using millimeter waves enables high-data-rate signal transmission with low power and is expected to be applied in the future, but not only a single set of transmission but also a combination of multiple frequencies within the device Need to be transmitted. When signals having a plurality of frequencies adjacent to the reception band are received, if the linear performance of the amplifier or the frequency mixing unit is low, third-order distortion occurs in the reception band, and reception quality is significantly degraded.

  For this reason, for example, as shown in FIG. 22, a band limiting filter (BPF: band pass filter) having high selectivity is used to pass only the band to be received to the input unit of the receiving circuit and attenuate adjacent frequency components. to add. In this case, the cost of components is increased, and when the semiconductor integrated circuit cannot be incorporated, the substrate area is increased. In addition, since the band limiting filter generally operates only on a fixed frequency, it is difficult to use the corresponding frequency in a variable manner, and it is necessary to prepare for each band to be used. Increased cost for management. In addition, when the selectivity of the band limiting filter is low, it is necessary to increase the linear performance of the circuit, and there is a concern about cost increase due to an increase in power consumption and an increase in chip size.

  Japanese Patent Application Laid-Open No. 55-38777 discloses a narrowband modulation at a position that is an integral multiple of the reception bandwidth fc of the spread modulation as a method for relaxing the performance of the receiver in the case of a combination of spread spectrum and narrowband modulation. There has been proposed a method of arranging the frequencies. However, when a plurality of narrowband modulations are used, the third-order distortion is generated in the band of the spread modulation, and there is a difficulty that cannot be applied in the case of a plurality of spread modulations.

  On the other hand, in the method of the present embodiment, each carrier frequency is set at an appropriate frequency position that is not affected by interference due to modulation distortion. For this reason, the linear performance of the receiver amplifier, frequency mixing unit (mixer), etc. can be relaxed without using a highly selective band-limiting filter, reducing costs, reducing power consumption, reducing circuit scale, etc. Can be done.

<Communication processing system: Modification>
FIG. 23 to FIG. 24 are modified configurations for explaining the signal interface of the signal transmission device of the present embodiment from the functional configuration side. This modified configuration applies fixed parameter settings to the above-described embodiments (including examples). Hereinafter, a modified example of the basic configuration shown in FIG. 1 will be described.

  First, the first modified configuration shown in FIG. 23 will be described. The first communication device 100 includes a first set value processing unit 7100 including a first set value determining unit 7110, a first set value storage unit 7130, and a first operation control unit 7150 on the substrate 102. The first set value determining unit 7110 determines “set values for signal processing” (variables, parameters) for designating the operation of each functional unit of the semiconductor chip 103 (in other words, the overall operation of the first communication device 100). To do. A plurality of sets of modulation circuits and demodulation circuits are provided, and each set transmits a signal simultaneously with each other by using a carrier signal having a different frequency (especially radio waves). The “set value” corresponds to a modulation carrier frequency or a demodulation carrier frequency. The process for determining the set value is performed, for example, when the product is shipped at the factory. First setting value storage unit 7130 stores the setting value determined by first setting value determination unit 7110. The first operation control unit 7150 controls each functional unit (in this example, the modulation unit 115, the frequency conversion unit 116, the amplification unit 117, etc.) of the semiconductor chip 103 based on the setting value read from the first setting value storage unit 7130. Make it work.

  In the example shown in FIG. 23, the first setting value processing unit 7100 is provided on the substrate 102. However, the present invention is not limited to this, but the first setting value processing unit 7100 is mounted on the semiconductor chip 103. The substrate 102 may be mounted on a different substrate. In the example shown in FIG. 23, the first set value processing unit 7100 is provided outside the semiconductor chip 103, but the first set value processing unit 7100 may be built in the semiconductor chip 103. In this case, the first set value processing unit 7100 is mounted on the same substrate 102 as the substrate 102 on which each functional unit to be controlled (modulation unit 115, frequency conversion unit 116, amplification unit 117, etc.) is mounted. (The illustration is omitted).

  The second communication device 200 includes a second set value processing unit 7200 including a second set value determining unit 7210, a second set value storage unit 7230, and a second operation control unit 7250 on the substrate 202. The second set value determining unit 7210 determines set values (variables, parameters) for designating the operation of each functional unit of the semiconductor chip 203 (in other words, the overall operation of the second communication device 200). The process for determining the set value is performed, for example, when the product is shipped at the factory. Second setting value storage unit 7230 stores the setting value determined by second setting value determination unit 7210. The second operation control unit 7250 controls each function unit (in this example, the amplification unit 224, the frequency conversion unit 225, the demodulation unit 226, etc.) of the semiconductor chip 203 based on the setting value read from the second setting value storage unit 7230. Make it work.

  In the example shown in FIG. 23, the second setting value processing unit 7200 is provided on the substrate 202. However, the present invention is not limited to this, but the second setting value processing unit 7200 is mounted on the semiconductor chip 203. It may be mounted on a substrate different from the substrate 202 that has been formed. In the example shown in FIG. 23, the second set value processing unit 7200 is shown as an example provided outside the semiconductor chip 203. However, the second set value processing unit 7200 may be built in the semiconductor chip 203. In this case, the second set value processing unit 7200 is mounted on the same substrate 202 as the substrate 202 on which each functional unit (amplifier 224, frequency converter 225, demodulator 226) to be controlled is mounted. (The illustration is omitted).

  Next, the second modified configuration shown in FIG. 24 will be described. The second modified configuration is characterized in that a set value determined outside the apparatus is stored. Below, it demonstrates centering around difference with a 1st deformation | transformation structure. The second modified configuration includes a first input / output interface unit 7170 instead of the first set value determination unit 7110, and a second input / output interface unit 7270 instead of the second set value determination unit 7210. Each of first input / output interface unit 7170 and second input / output interface unit 7270 is an example of a setting value receiving unit that receives a setting value from the outside.

  The first input / output interface unit 7170 has an interface function with the first set value storage unit 7130, stores a set value given from the outside in the first set value storage unit 7130, and also stores a first set value storage. The setting value stored in the unit 7130 is read and output to the outside. The second input / output interface unit 7270 functions as an interface with the second set value storage unit 7230. The second input / output interface unit 7270 stores a set value given from the outside in the second set value storage unit 7230, and also stores the second setting value. The set value stored in the value storage unit 7230 is read and output to the outside.

  In the case of the second modified configuration, the setting value is not determined by the first setting value processing unit 7100 or the second setting value processing unit 7200 but is determined externally. For example, the set value may be determined from the design parameters and the actual machine state, or the set value may be determined based on an actual operation test of the apparatus. In any case, a setting value common to each apparatus may be determined instead of determining an individual setting value for each apparatus. The case where the set value is determined from the design parameters generally corresponds to this case, and the case where the set value is determined based on an actual test with a standard apparatus also corresponds to this case.

  DESCRIPTION OF SYMBOLS 1 ... Signal transmission apparatus, 100 ... 1st communication apparatus (it has a function of a 1st communication part), 200 ... 2nd communication apparatus (it has a function of a 2nd communication part), 500 ... Imaging device (of electronic equipment) Example), 702 ... Frequency control unit, 704 ... Frequency control unit, 101B ... Electronic device, 201B ... Memory card (example of electronic device), 101K ... Image acquisition device (example of electronic device), 201K ... Image reproduction device (electronic) Example of device), 751... Electronic device, 752... Electronic device, 753... Electronic device, 7100... First setting value processing unit, 7200.

Claims (20)

  1. A plurality of modulation units that modulate the transmission target signal and a demodulation unit that demodulates the modulation signal modulated by the modulation unit are provided,
    About the carrier frequency of each different frequency used in each set consisting of the modulation unit and the demodulation unit,
    The frequency of the third-order intermodulation distortion component generated based on the two adjacent carrier frequencies does not exist in any of the reception bands of the modulation signals based on the remaining carrier frequencies.
    A signal transmission device in which each carrier frequency is set.
  2. When the modulated signal modulated by the modulating unit is transmitted as a radio signal, and the radio signal is received and input to the demodulating unit to perform signal transmission, each pair used by the modulating unit and the demodulating unit is different. About the carrier frequency of the frequency
    The signal transmission device according to claim 1, wherein each carrier frequency is set so that reception bands of modulated signals based on each carrier frequency do not overlap each other.
  3. The difference between the lowest carrier frequency and the intermediate carrier frequency among the three adjacent carrier frequencies is defined as the first frequency difference, and the highest carrier frequency between the adjacent three carrier frequencies and the intermediate frequency. When the difference between the carrier frequency and the carrier frequency is the second frequency difference, the high frequency of the modulation signal based on the carrier frequency on the low frequency side that defines the smaller one of the first frequency difference and the second frequency difference The sum of the reception bandwidth on the side and the reception bandwidth on the low frequency side of the modulation signal based on the carrier frequency on the high frequency side that defines the smaller one of the first frequency difference and the second frequency difference is the first The first condition that the frequency difference is smaller than the smaller one of the frequency difference and the second frequency difference is satisfied,
    When the first frequency difference is smaller than the second frequency difference, the difference between the first frequency difference and the second frequency difference is the reception of the modulated signal based on the lowest carrier frequency on the low frequency side. So that the second condition is satisfied that the bandwidth is larger than the larger one of the reception bandwidths on the low frequency side of the modulation signal based on the highest carrier frequency,
    When the first frequency difference is larger than the second frequency difference, the difference between the first frequency difference and the second frequency difference is the reception of the modulated signal on the high frequency side based on the lowest carrier frequency. In order to satisfy the third condition that the bandwidth is larger than the larger one of the reception bandwidths on the high frequency side of the modulation signal based on the highest carrier frequency,
    The signal transmission device according to claim 1, wherein three adjacent carrier frequencies are set.
  4. 4 or more carrier frequencies are used,
    For each combination of three adjacent carrier frequencies,
    As the first condition is met,
    The second condition is satisfied when the first frequency difference is smaller than the second frequency difference, and the third condition is satisfied when the first frequency difference is larger than the second frequency difference. The signal transmission device according to claim 3, wherein each carrier frequency is set.
  5. 4 or more carrier frequencies are used,
    For each combination of three adjacent carrier frequencies,
    Of the three carrier frequencies, the intermodulation wave generated on the lower frequency side than the lowest carrier frequency among the intermodulation waves generated based on the lowest carrier frequency and the intermediate carrier frequency Is not in the reception band of the modulated signal based on the carrier frequency on the lower frequency side than the lowest carrier frequency,
    Of the three carrier frequencies, the intermodulation wave generated on the higher frequency side than the highest carrier frequency among the intermodulation waves generated based on the highest carrier frequency and the intermediate carrier frequency 4. The signal transmission device according to claim 3, wherein each carrier frequency is set so as not to exist in a reception band of a modulated signal based on a carrier frequency on a higher frequency side than a carrier frequency having the highest frequency.
  6. The transmission characteristics between transmission and reception are known,
    A signal processing unit for performing predetermined signal processing based on the set value;
    The signal transmission device according to claim 1, further comprising: a set value processing unit that inputs a predetermined set value for signal processing to the signal processing unit.
  7.   The signal transmission device according to any one of claims 1 to 6, wherein all of the modulation unit and the demodulation unit are arranged on one circuit board.
  8. All of the modulator and demodulator are located on a single circuit board,
    The signal transmission device according to any one of claims 1 to 6, further comprising a control unit that switches a carrier frequency used by each modulation unit for transmission.
  9. All of the modulator and demodulator are located on a single circuit board,
    The signal transmission device according to any one of claims 1 to 6, further comprising a control unit that switches a carrier frequency used by each demodulator for reception.
  10. All of the modulator and demodulator are located on a single circuit board,
    The signal transmission device according to any one of claims 1 to 6, further comprising a control unit that switches a carrier frequency used by each modulation unit for transmission and a carrier frequency used by each demodulation unit for reception.
  11. Modulator and demodulator are scattered across multiple circuit boards,
    The signal transmission device according to any one of claims 1 to 6, further comprising a control unit that switches a carrier frequency used by each modulation unit for transmission.
  12. Modulator and demodulator are scattered across multiple circuit boards,
    The signal transmission device according to any one of claims 1 to 6, further comprising a control unit that switches a carrier frequency used by each demodulator for reception.
  13. Modulator and demodulator are scattered across multiple circuit boards,
    The signal transmission device according to any one of claims 1 to 6, further comprising a control unit that switches a carrier frequency used by each modulation unit for transmission and a carrier frequency used by each demodulation unit for reception.
  14.   The signal transmission device according to any one of claims 8 to 10, wherein a control signal for the control unit to switch the carrier frequency is transmitted to the modulation unit or the demodulation unit by wire.
  15.   The signal transmission device according to any one of claims 8 to 13, wherein a control signal for the control unit to switch the carrier frequency is wirelessly transmitted to the modulation unit or the demodulation unit.
  16.   The signal transmission device according to claim 15, wherein the control unit makes the use band of the radio signal of the control signal for switching the carrier frequency outside the use band of the radio signal of the transmission target signal.
  17. The control unit
    The wireless signal usage band of the control signal for switching the carrier frequency is changed to the wireless signal usage band of the transmission target signal,
    For the carrier frequency of the control signal radio signal,
    The frequency of the intermodulation distortion component generated based on the two adjacent carrier frequencies does not exist in any of the reception bands of the modulation signals based on the remaining carrier frequencies.
    The signal transmission device according to claim 15, wherein each carrier frequency is set.
  18. A plurality of modulation units that modulate the transmission target signal and a plurality of demodulation units that demodulate the modulation signals modulated by the modulation unit are arranged in one casing,
    About the carrier frequency of each different frequency used in each set consisting of the modulation unit and the demodulation unit,
    The frequency of the third-order intermodulation distortion component generated based on the two adjacent carrier frequencies does not exist in any of the reception bands of the modulation signals based on the remaining carrier frequencies.
    Electronic equipment for which each carrier frequency is set.
  19. A first electronic device in which at least one of a modulation unit that modulates a transmission target signal and a demodulation unit that demodulates a modulation signal modulated by the modulation unit is disposed in one housing;
    A second electronic device in which each of the demodulation unit corresponding to each modulation unit of the first electronic device and each of the modulation unit corresponding to each demodulation unit of the first electronic device are arranged in one housing;
    With
    When the first electronic device and the second electronic device are arranged at predetermined positions, a wireless signal transmission path is formed that enables transmission of the modulated signal modulated by the modulator as a wireless signal. And
    About the carrier frequency of each different frequency used in each set consisting of the modulation unit and the demodulation unit,
    The frequency of the third-order intermodulation distortion component generated based on the two adjacent carrier frequencies does not exist in any of the reception bands of the modulation signals based on the remaining carrier frequencies.
    Electronic equipment for which each carrier frequency is set.
  20. A plurality of modulation units that modulate the transmission target signal and a demodulation unit that demodulates the modulation signal modulated by the modulation unit,
    About the carrier frequency of each different frequency used in each set consisting of the modulation unit and the demodulation unit,
    Each carrier frequency is set so that the frequency of the third-order intermodulation distortion component generated based on two adjacent carrier frequencies does not exist in the reception band of the modulated signal based on each remaining carrier frequency. Signal transmission method.
JP2010233695A 2010-10-18 2010-10-18 Signal transmission device, electronic apparatus, and signal transmission method Pending JP2012089997A (en)

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JP2010233695A JP2012089997A (en) 2010-10-18 2010-10-18 Signal transmission device, electronic apparatus, and signal transmission method

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
JP2010233695A JP2012089997A (en) 2010-10-18 2010-10-18 Signal transmission device, electronic apparatus, and signal transmission method
US13/137,732 US8688153B2 (en) 2010-10-18 2011-09-08 Signal transmission apparatus, electronic device, and signal transmission method
EP11184626A EP2442452A1 (en) 2010-10-18 2011-10-11 Signal transmission apparatus, electronic device, and signal transmission method
RU2011141289/07A RU2011141289A (en) 2010-10-18 2011-10-11 Signal transmission device, electronic device and signal transmission method
CN2011103054635A CN102571269A (en) 2010-10-18 2011-10-11 Signal transmission apparatus, electronic device, and signal transmission method
BRPI1106281-9A BRPI1106281A2 (en) 2010-10-18 2011-10-11 signal transmission apparatus, electronic device, and, signal transmission method

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JP2009206878A (en) * 2008-02-28 2009-09-10 Sony Corp Electronic apparatus, control method and program

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US20120094614A1 (en) 2012-04-19

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